It's a pretty easy job. Just pay attention to how the old belt was routed. There is a diagram on the top belt cover as well.
THe hardest part is releasing the tension on the belt. You can do this with a breaker bar with a 1/2"(I think) shaft on the end inserted into the tensioner pully. I didn't have many tools when I did mine, so I just pulled up on the tensioner by hand. I don't recommend this however because it is near imposible to do because there is so much tension, and depending on how big your hand/arm is, it is hard to get it in there with a good grip. A breaker bar makes this much simpler and safer
I used a regular 3/4" socket wrench, and I slid a length of pipe on the handle to give me better leverage. Have someone else hold that while you route the belt, since it's tough to hold and mount the belt at the same time.