LEarning to do some of your own repairs and adjustments is always a wise investment in yourself. The more you practice the better you will get at diagnosing and fixing problems. And bike repair is not rocket science -- check out the Park Tool site, work slowly and carefully and keep all the parts carefully sorted out so you can reassemble it all when you are done. That being said, I second the idea of checking out other shops for ones with a better attitude. I've not found huge price difference betwwen shops in my area, but attitude can be very different.