I just did my drive belts (3) this Sunday and wow that was very easy! I would recomend that if you are even remotely mechanically inclined that you should try to do this, it will save you atleast 100 bucks. I was quoted $170 for mine and then bought the belts for ~$35 at my local Nissan dealership. I got a discount on the belts themselves and with no sales tax by using a co-worker of mine who happens to work at a local car lot. It only took me about an hour but being my first time doing it I think I could do it in about 20-25 minutes next time.

Yep. About a 30-45 minute job with a 12mm and 14mm wrench. Good job!

It was a PITA compared to the single belt on my last truck (F-250), which was about a 2 minute job, but it's still very easy and well worth doing it yourself.