First thing you do if you're going to turn the wrench yourself is go to Autozone, the library, or somewhere and get yourself a repair manual. Haynes or Chilton's books have pictures as well as step by step instructions, and they only run $20 or so. Even if you don't do the work yourself, its a good idea to look through the book so you know what's involved so you can throw the B.S. flag when someone tries to overcharge you.
Second, find an automotive forum that specializes in your type of vehicle. Gearheads can warn you in advance of any gotchas involved with your particular problem.
Its easier if you have a car that a lot of tuners or amateur racers have (like my Neon and Focus....), but there's a lot of Buicks out there, I'm sure you can find something.
.