It's a really simple process, really. Assuming you already know how to import the rig and puppet your other model, you want to run the Alpha script. This will most likely make the torso of the puppet not move so it'll look kinda jank when you run it. Fixing this problem is easy. All you have to do is run the Delta script as well. Everything should work from then on (besides positioning but it should've been done before running the script.)