I have 2 far and away favorites, one for each answer.
Favorite tool, my metal finger picks for my guitars. I still get to feel like it's my hands doing the Magic, but get to do it with the nails of ruthless lady lers. Also, evil trick sometimes I put them in the freezer for a few minutes to make them super cold too
Favorite position, by far and away the upside down Y. Arms stretched up high, legs spread far apart. Face up or down doesn't matter it's the perfect stretched position to expose every spot in my opinion