Contrary to popular opinion, the Pit Bull is a loving family dog who develops a keen sense of dependence on his human "pack." Once you develop a strong bond with your Bully, the two of you will become virtually inseparable and you will need to spend plenty of time every day together. One important step in helping to teach your pup to remain calm before being groomed is to ensure he masters basic obedience commands as quickly as possible. This will help with all other forms of training, including teaching your dog how to tolerate--even enjoy--grooming sessions.
Truth be told, Buster doesn't really care how often he gets groomed or, for that matter, if he gets groomed. At the same time, he is probably more than a little scared of the brush and of being touched on his sensitive areas. It is very important that you take your time working your way to the point where he is calm enough to be groomed.
While Buster might struggle a bit when he is a puppy, this should not go on for long as most dogs will calm down as they mature. Keep working with your pup, take your time, and let Buster set the pace. Use this time to bond with Buster in a way that no other chore, task, or form of play can do.