There are two shops in my town. One is great. 3 employees, 2 of which have been working there for almost 30 years and the 3rd is a certified race mechanic who also builds frames.

The other shop is staffed by college students with no idea what they are talking about. I once went in there to ask if they had any mountain bike clipless shoes and the dude proceeded to show me the clipless pedals. a friend went in there to buy new pedals and have them put on and the dude putting them on couldn't figure out why the pedal(one designed for 1 piece cranks) wouldn't thread in.

Needless to say i avoid one of them.