diff --git a/README.md b/README.md
index 44b1224a..3f377a3a 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,31 @@
 # 🥧 PIE (PHP Installer for Extensions)
 
+## What is PIE?
+
+PIE is a new installer for PHP extensions, intended to eventually replace PECL.
+It is distributed as a [PHAR](https://www.php.net/manual/en/intro.phar.php),
+just like Composer, and works in a similar way to Composer, but it installs PHP
+extensions (PHP Modules or Zend Extensions) to your PHP installation, rather
+than pulling PHP packages into your project or library.
+
+## What do I need to get started?
+
 You will need PHP 8.1 or newer to run PIE, but PIE can install an extension to
 any installed PHP version.
 
+On Linux, you will need a build toolchain installed. On Debian/Ubuntu type
+systems, you could run something like:
+
+```shell
+sudo apt install gcc make autoconf libtool bison re2c pkg-config
+```
+
+On Windows, you do not need any build toolchain installed, since PHP extensions
+for Windows are distributed as pre-compiled packages containing the extension
+DLL.
+
+## I'm an extension maintainer
+
 If you are an extension maintainer wanting to add PIE support to your extension,
 please read [extension-maintainers](./docs/extension-maintainers.md).
 
diff --git a/docs/extension-maintainers.md b/docs/extension-maintainers.md
index 1c7054af..ac818004 100644
--- a/docs/extension-maintainers.md
+++ b/docs/extension-maintainers.md
@@ -240,6 +240,65 @@ Cannot use myvendor/myextension's latest version 1.2.3 as it requires
 ext-something * which is missing from your platform.
 ```
 
+#### Checking the extension will work
+
+First up, you can use `composer validate` to check your `composer.json` is
+formatted correctly, e.g.:
+
+```shelle
+$ composer validate
+./composer.json is valid
+```
+
+You may then use `pie install` to install your extension while in its directory:
+
+```shell
+$ cd /path/to/my/extension
+$ pie install
+🥧 PHP Installer for Extensions (PIE) 1.0.0, from The PHP Foundation
+Installing PIE extension from /home/james/workspace/phpf/example-pie-extension
+This command may need elevated privileges, and may prompt you for your password.
+You are running PHP 8.4.8
+Target PHP installation: 8.4.8 nts, on Linux/OSX/etc x86_64 (from /usr/bin/php8.4)
+Found package: asgrim/example-pie-extension:dev-main which provides ext-example_pie_extension
+Extracted asgrim/example-pie-extension:dev-main source to: /home/james/.config/pie/php8.4_572ee73609adb95bf0b8539fecdc5c0e/vendor/asgrim/example-pie-extension
+Build files cleaned up.
+phpize complete.
+Configure complete.
+Build complete: /home/james/.config/pie/php8.4_572ee73609adb95bf0b8539fecdc5c0e/vendor/asgrim/example-pie-extension/modules/example_pie_extension.so
+Cannot write to /usr/lib/php/20240924, so using sudo to elevate privileges.
+Install complete: /usr/lib/php/20240924/example_pie_extension.so
+✅ Extension is enabled and loaded in /usr/bin/php8.4
+```
+
+##### Building without installing
+
+If you want to just test the build of your application, without installling it
+to your target PHP version, you will first need to your extension directory as
+a "path" type repository:
+
+```shell
+$ cd /path/to/my/extension
+$ pie repository:add path .
+🥧 PHP Installer for Extensions (PIE) 1.0.0, from The PHP Foundation
+You are running PHP 8.4.8
+Target PHP installation: 8.4.8 nts, on Linux/OSX/etc x86_64 (from /usr/bin/php8.4)
+The following repositories are in use for this Target PHP:
+  - Path Repository (/home/james/workspace/phpf/example-pie-extension)
+  - Packagist
+```
+
+Then you may test that it builds with:
+
+```shell
+$ pie build asgrim/example-pie-extension:*@dev
+```
+
+> [!TIP]
+> Since your extension is not yet published to Packagist, you should specify
+> `*@dev` as the version constraint, otherwise PIE will not find your extension
+> as the default stability is `stable`.
+
 ### Submit the extension to Packagist
 
 Once you have committed your `composer.json` to your repository, you may then