...which links to a page which links to a post which links to the docs which says I need JRE and Compass...
Seriously? Just to get started?
I just want to be able to do a quick 'Hello World' and I'm tearing my hair out because I don't even know if I'm following the right install instructions.
So is there an up-to-date guide? Can I get a bullet list?
There are some supporting tools that will need to exist on your system:
Ruby - Use this to install SASS and Compass if not already on your machine. If you're on Windows, you'll need to download Ruby. If you're on a Mac, it's already there.
SASS - Manages the styles/theming of Sencha Touch, install this using Ruby
A modern browser to test in such as Google Chrome or Apple Safari
If you had previously installed the Sencha SDK Tools, I'd recommend uninstalling that first before installing Sencha Cmd as they share the same command 'sencha'.
Once you have everything installed:
Open a command line
Change directory to the root of your sencha touch 2.1 library
Run the command sencha generate app MyApp [pathToTheApp] where [pathToTheApp] is a path to a web serverable directory. MyApp is the name of the application (it can be whatever you like)
Run the app in your browser.
That's the 'hello world' app that is auto-generated.
Try it out, if it fails post a reply with the errors you get or questions you have. There are a good group of people on this forum ready to help.