If you have VERY basic mechanical skills, maybe the dealer is a better bet. I get mine done for about 150 bucks every 8-10 thousand miles. It's worth it to me, more for the fact that I have no garage, so all my work is driveway done. A lot of guys here have done them, most succeed, some fail and bend valves.

Always remember to be yourself. Unless you suck. Then pretend to be someone else.