Animation and Rigging Tools: FAQ, Known Issues and Feature Roadmap

Hi!
I’m a newbie trying to learn, but I can’t find proper instructions or tutorials showing:

  1. How to use a custom mesh.
    I know about Animation menu –> Skin —> Smooth bind. But it gives me very unsatisfactory results:
    Imgur: The magic of the Internet

  2. How to use Mixamo animations with A.R.T… I tried to import some onto the default rig but with very unsatisfactory results:
    Imgur: The magic of the Internet

So my question is: Are there no instructions or tutorials showing how to do this?