Personally, as good of a mechanic as I am, I in fact paid the dealership to change my timing belts. Kissing off valves because of a misaligned belt or broken belt is not a good thing, well it might be if you're in the market for a new head.

My mom though unfortunately has a leaking water pump in her Camry so I may have to do that myself soon, and in the process, I'll put in a new timing belt (since you gotta remove it to get to it anyway).