The best way to do anything nowadays is doin it yourself. But i guess a pro is more practical right?
Actually if your adventurous like me try goin to your local parts place and pick up a rebuild kit for it and get a hayes book to go with it. the rebuild is pretty simple. just take your time and set the parts you take out in order. As you start your rebuild use the new parts in the order the old parts are laid out in. And MAKE SURE YOU FOLLOW THE DIRECTIONS CAREFULLY....best wishes and good luck with your rebuild bro.