We recommend you do weight painting last because it will be the longest part of this assignment. And you will have to have created your wrap deformers and your bind skeleton before you can proceed with this. If you are getting to caught up in this, make sure that you leave enough time for the finishing up steps.
1: Select the mime_lowPoly group and the top joint of all the bind skeleton chains (select the group node won't work on the joints) and then do a smooth bind with the following settings: