I don\'t want to rely on the one-click installer any more, and I want to learn how to install Ruby manually. Is there a resource for this?
Well, if you're on a Mac I'd recommend MacPorts. There's a good post on it here that's still valid.
If you're on Windows and don't want to use the one-click installer you can install Cygwin and build ruby through it. Here's a post I found.