Best way I know to practice follow through is to always try to fire two shots on skeet singles. First breaks the target (supposedly) and for the second pick out a chip to break. Really makes one stay with the bird. On skeet doubles if you miss the first bird with your shot, stay with him and shoot a second time. Of course, this is recreational skeet not registered. It really helps to always begin the shot with a low gun. Pre-mounted is too mechanical and there is nothing spontaneous or instinctive about it.
Joe: I think it is an excellent idea to shoot at a broken piece as a second shot on the skeet field for working on 'follow through' and I intend practicing this. I am going to practice this with a mounted gun for 'tournament' skeet reasons rather than low gun. I think the most important thing for making a good follow through is establishing proper form and stance prior to the shot which will carry over for follow through. Thanks for this good advice.