These are some tips for doing this weight painting in Blender.
to see joints through mesh >>> in pose mode select bone, in object menu (small cube) click X-ray
to see weights to each bone >>> in edit mode N
to make sure mesh is symmetric for x-mirror >>> in edit mode, mesh, snap symmetry with all vertices selected
navigation
pan >>> with wacom pencil, ctrl+leftclick+lowmidbtn or shift+leftclick+lowmidbtn
orbit >>> alt+leftclick
accept rotation >>> click
Inspired by,
DanPro https://www.youtube.com/watch?v=QXhrLnqRvd8 (his weight painting tips were very helpful)
