If you are practicing and start hitting bad shots then step away from the ball and work on re-establishing solid contact with a few bump shots in order to get the feel for center clubface hits
Keeping your right hand on the grip in a neutral positoin allows the clubface to come into impact square, turning that hand in either direction will cause the face to close or open at the top of the backswing
Hitting the ball fat tends to come from either falling backward on your backswing or overusing your hands and uncocking your wrists too early