diff --git a/README.md b/README.md
index a5b7e85..29880e5 100644
--- a/README.md
+++ b/README.md
@@ -4,5 +4,8 @@ A very hacky Matrix-LINE bridge based on running LINE's Chrome extension in Pupp
 ## Features & roadmap
 [ROADMAP.md](ROADMAP.md)
 
+## Setup
+[SETUP.md](SETUP.md)
+
 ## Discussion
 Matrix room: [`#mautrix-line:miscworks.net`](https://matrix.to/#/#mautrix-line:miscworks.net)
diff --git a/SETUP.md b/SETUP.md
new file mode 100644
index 0000000..62a5442
--- /dev/null
+++ b/SETUP.md
@@ -0,0 +1,13 @@
+# Setup
+1. Download the .crx file of the [LINE Chrome extension](https://chrome.google.com/webstore/detail/line/ophjlpahpchlmihnnnihgmmeilfjmjjc) (version 2.4.1), and extract it to `puppet/extension_files`
+2. `cd` to the `puppet` directory and run `yarn --production`
+3. Run `node prep_helper.js` to open the version of Chrome downloaded by Puppeteer, and click on the LINE icon next to the URL bar
+4. Once the LINE popup appears, press F12 to show DevTools, which will reveal the LINE extension's UUID
+5. Copy `puppet/example-config.json` to `puppet/config.json`, and update it with the UUID found in the previous step
+6. Launch the Puppeteer module with `yarn start` or `node src/main.js`
+7. `cd` to the main directory and create a Python virtual environment with `virtualenv -p /usr/bin/python3 .venv`, and enter it with `source .venv/bin/activate`
+8. Install Python requirements with `pip install -r requirements.txt`
+9. Copy `mautrix_line/example-config.yaml` to `config.yaml`, and update it with the proper settings to connect to your homeserver
+10. Run `python -m mautrix_line -g` to generate an appservice registration file, and update your homeserver configuration to accept it
+11. Run the bridge with `python -m mautrix_line`
+12. Start a chat with the bot and follow the instructions
diff --git a/puppet/prep_helper.js b/puppet/prep_helper.js
new file mode 100644
index 0000000..4446804
--- /dev/null
+++ b/puppet/prep_helper.js
@@ -0,0 +1,13 @@
+import puppeteer from "puppeteer"
+
+(async () =>
+{
+    const pathToExtension = "extension_files"
+    const browser = await puppeteer.launch({
+        headless: false,
+        args: [
+            `--disable-extensions-except=${pathToExtension}`,
+            `--load-extension=${pathToExtension}`
+        ]
+    })
+})()