With a buried lie you must use your sand wedge as a digger to get below the bottom of the ball so square the clubface to dig into the sand and create a more downward swing arc
Look up and down at least twice to burn an impression of the line to the target in your mind
Controling your ball from the rough so that you can actually hit the green requires a steeper swing, gripping down slightly and a tighter grip so that you can keep the clubface square and a minimum of grass between the clubface and the ball