mhx imported rig?

Anyone have some suggestions on how the rig works on imported mhx (MakeHuman) files?

Halloween is around the corner, and I had the rough idea to create a starting point from MH and add in some wings and maybe a tail, but I’m quite dim when it comes to understanding the 376 different ways you can do rigging in Blender, and my first attempts at “just throw bones at it” isn’t quite working out.

How can I get smarter about what the mhx rig is doing and how to muck about with it? Many thanks!