For plastics and metals I use mat enamel rattlecans. For bones you MUST brush on the first later in undiluted acrylic. Add water and it will bead off the surface.
Repeat until finished.
Overbrushing is like drybrushing but wetter- you just hit raised areas but it isn't subtlr
Never put minis between yourself and your palette. Mix paint with a stick or an old brush- never the one you paint with.
I also mainly use Vallejo Model Color and some games workshop paints.
Lahmium medium is a must for me
Ooh, and reaper master series