I believe that Huron Lagoons marina offers driving and docking classes. I was in your shoes a few years ago and a 12 pack of beer to an experienced boater got me a hands on class for an hour or so. His biggest advice was only go as fast as you want to hit something. After a few times and learning what your boat will do all your jitters will go away. Also tell your passengers not to move around, it will turn your boat in directions your not expecting.