I learned how to play bunker shots from Tom Pernice, who learned from Seve Ballesteros, so you’re two people away from getting a Seve bunker lesson.
At address, you stand pretty square with your feet and knees flaring out, your club shaft is neutral and the face is barely open. Squat down and get your hands low, a little left and the swing itself is literally a pick-it-up and drop it.