Unlike regular bunker shots, with the long bunker shot you are not trying to fly the ball to the hole you want it to roll, so take a lower lofted club and end with a lower follow through
Usually you want to splash your ball and the sand out of a bunker, but when the ball is buried this will cause a skull, so in this situation you need to use your sand wedge to dig below the ball
Start reading a green as you approach it walking or riding up, read the slope from the low point of the green paying particular attention to the area closer to the hole as the ball is rolling slower and will break more