Ball forward,weight forward.
Control the length of the bunker shot by the length of the follow-through.
To get the bounce on the sand wedge to work (so it won't dig,but will slide under the ball),let the clubhead pass your hands on the downswing.
Open the clubface, then
grip the club as follows:
Put both hands into an extremely weak position.For a right-hander,the left thumb will be at 11 o'clock,with no knuckles showing;the right hand would also be at 11 o'clock, with 2-3 knuckles showing. In other words,the right hand will be on top of the shaft. This will keep the face open and thus expose expose the bounce to prevent digging.
Aim slightly behind the ball +/- 2 inches.