I think if you can use Github's instructions for creating a new development environment on your local machine

This is the easy part.

and use our wiki instructions for updating your Dreamhack, you should be able to get up and running

This is the part that makes no sense to me because 1) instructions are all over the place 2) it's not 100% clear to me what are the parts for hacks and what aren't 3) don't tell me where or how to do this. I feel like I'm back when I got into dev work since there were zero instructions for newbies on windows.