Legs over the shoulder in miss is not the pile driver. Pile driver is usually where the girl is on the floor and most of her weight is on her upper back and shoulders as her ass and legs are way up in the air and kind of in line with her head. The guy squats and goes towards at her towards the floor and away from the floor. Hence, pile driver. You can help the girl support her ass in the air with your hands or even use the couch to kind of give the girl something to help out weight on with the back of her butt to help with this one.