Maintain a constant posture throughout the entire swing so that your body does not move towards the ball during the swing and cause the heel of the club to make contact with the ball
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
Turn your 8-iron into a sand wedge by opening the face and playing the ball like a normal greenside shot