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
Although not a very pretty shot if you level your shoulders to the slope, aim left and walk through the shot it can be very effective