Tweak the order of things and wording

Biggest change to the flow: the /etc/hosts/ change doesn't need to be done in the Flox flow, since the Flox activation script already takes care of this.

contents/handbook/engineering/developing-locally.md

@@ -71,14 +71,14 @@ This is a faster option to get up and running. If you don't want to or can't use
 
 2. Install the package manager Homebrew by following the [instructions here](https://brew.sh/).
 
-<blockquote class="warning-note">
-    After installation, make sure to follow the instructions printed in your terminal to add Homebrew to your{' '}
-    <code>$PATH</code>. Otherwise the command line will not know about packages installed with <code>brew</code>.
-</blockquote>
+    <blockquote class="warning-note">
+        After installation, make sure to follow the instructions printed in your terminal to add Homebrew to your{' '}
+        <code>$PATH</code>. Otherwise the command line will not know about packages installed with <code>brew</code>.
+    </blockquote>
 
 3. Install [OrbStack](https://orbstack.dev/) – a more performant Docker Desktop alternative – with `brew install orbstack`. Go to OrbStack settings and set the memory usage limit to **at least 4 GB** (or 8 GB if you can afford it) + the CPU usage limit to at least 4 cores (i.e. 400%). You'll want to use Brex for the license if you work at PostHog.
 
-4. Continue with the [common prerequisites for both macOS and Linux](#common-prerequisites-for-both-macos--linux).
+4. Continue with [cloning the repository](#cloning-the-repository).
 
 #### Ubuntu
 
@@ -89,48 +89,56 @@ This is a faster option to get up and running. If you don't want to or can't use
     ```bash
     sudo apt install -y build-essential
     ```
-3. Continue with the [common prerequisites for both macOS and Linux](#common-prerequisites-for-both-macos--linux).
+3. Continue with [cloning the repository](#cloning-the-repository).
 
-#### Common prerequisites for both macOS & Linux
+#### Cloning the repository
 
-1. Append line `127.0.0.1 kafka clickhouse` to `/etc/hosts`. You can do it in one line with:
 
-    ```bash
-    echo '127.0.0.1 kafka clickhouse' | sudo tee -a /etc/hosts
-    ```
+Clone the [PostHog repo](https://github.com/posthog/posthog). All future commands assume you're inside the `posthog/` folder.
 
-    ClickHouse and Kafka won't be able to talk to each other without these mapped hosts.
+```bash
+git clone https://github.com/PostHog/posthog && cd posthog/
+```
 
-    > If you are using a newer (>=4.1) version of Podman instead of Docker, the host machine's `/etc/hosts` is used as the base hosts file for containers by default, instead of container's `/etc/hosts` like in Docker. This can make hostname resolution fail in the ClickHouse container, and can be mended by setting `base_hosts_file="none"` in [`containers.conf`](https://github.com/containers/common/blob/main/docs/containers.conf.5.md#containers-table).
+### Instant setup
 
-2. Clone the [PostHog repository](https://github.com/posthog/posthog). All future commands assume you're inside the `posthog/` folder.
+You can set your development environment up instantly using [Flox](https://flox.dev/). Flox is a dev environment manager, which takes care of the whole dependency graph needed to develop PostHog – all declared in the repo's `.flox/manifest.toml`. To get this environment going:
+
+1. Install Flox (plus `ruff` and `rustup` for pre-commit checks outside of the Flox env).
 
     ```bash
-    git clone https://github.com/PostHog/posthog && cd posthog/
+    brew install flox ruff rustup && rustup-init && rustup default stable
     ```
 
-### Environment setup
+2. From the root of the repository, activate the environment. (On first activation, you'll be prompted if you'd like the environment to be activated automatically using `direnv`.)
 
-You can set up your development environment quickly using [Flox](https://github.com/flox/flox). To do that, you should only need to:
-1. Install required system-level dependencies for flox:
-   
-```bash
-brew install flox ruff rustup && rustup-init && rustup default stable
-```
-2. From the root of the repository, activate the environment:
-```bash
-flox activate
-```
-This gets you a fully-fledged environment under `.flox/` in the repository directory's, with everything needed to run and develop PostHog. Once done, you'll see instructions for migrations and running the app. On the first activation you'll also be prompted if you'd like the environment to be activated automatically.
+    ```bash
+    flox activate
+    ```
+
+This gets you a fully fledged environment, with its executables and linked libraries stored under `.flox/`. You should now be seeing instructions for migrations and running the app.
+
+That's it! You can now change PostHog in any way you want. See [Project structure](/handbook/engineering/project-structure) for an intro to the repository's contents. To commit changes, create a new branch based on `master` for your intended change, and develop away.
 
 ### Manual setup
 
-Alternatively, if you would prefer not to use [Flox](https://github.com/flox/flox), you can manually setup your environment by following the next steps.
+Alternatively, if you'd prefer not to use [Flox-based instant setup](#instant-setup), you can set the environment up manually:
 
 #### 1. Spin up external services
 
 In this step we will start all the external services needed by PostHog to work.
 
+First, append line `127.0.0.1 kafka clickhouse` to `/etc/hosts`. Our ClickHouse and Kafka data services won't be able to talk to each other without these mapped hosts.  
+You can do this in one line with:
+
+```bash
+echo '127.0.0.1 kafka clickhouse' | sudo tee -a /etc/hosts
+```
+
+> If you are using a newer (>=4.1) version of Podman instead of Docker, the host machine's `/etc/hosts` is used as the base hosts file for containers by default, instead of container's `/etc/hosts` like in Docker. This can make hostname resolution fail in the ClickHouse container, and can be mended by setting `base_hosts_file="none"` in [`containers.conf`](https://github.com/containers/common/blob/main/docs/containers.conf.5.md#containers-table).
+
+Now, start the Docker Compose stack:
+
 ```bash
 docker compose -f docker-compose.dev.yml up
 ```
@@ -362,9 +370,7 @@ To get some practical test data into your brand-new instance of PostHog, run `DE
 
 #### 7. Develop
 
-This is it! You can now change PostHog in any way you want. See [Project Structure](/handbook/engineering/project-structure) for an intro to the repository's contents.
-
-To commit changes, create a new branch based on `master` for your intended change, and develop away. Just make sure not use to use `release-*` patterns in your branches unless putting out a new version of PostHog, as such branches have special handling related to releases.
+That's it! You can now change PostHog in any way you want. See [Project structure](/handbook/engineering/project-structure) for an intro to the repository's contents. To commit changes, create a new branch based on `master` for your intended change, and develop away.
 
 ## Testing