Originally Posted by Jeffblue

depends where you go. Look at their website if they have one. look at the types of cars they do. You'd rather go to a place that does very high end cars because they are probably better, if someone with a lambo/ferrari trusts them with their car, than you can certainly trust them with your Z. Where as if you go to joe shmoes place, and the highest end car he does is a VW Golf, you might want to reconsider.
The Junkman, a user on here, has a bunch of videos on youtube of how to do various parts of detailing and they are really good. If you have the right tools, products, and know how, you can do it yourself.