In my case, I changed the timing belt and water pump as part of a complete engine teardown, so I haven't tried it with the engine still inside the car. But I think it's reasonably straightforward. Prop up the oil pan on some kind of support, remove the motor mount, undo the serpentine belt, take the plastic covers off, and there's the timing belt.
It may even be possible to do the job without removing that motor mount, but I wouldn't want to try it.
When replacing it you also want to replace at least one of the two small idler pulleys near the base of it, because they wear out from being made too small. If you replace only one, I think it's the left hand one -- it has tension on it, while on the other one, the belt is nearly flat.
If you need to adjust cam timing, you will need a metal plate 0.200 inches thick. But with any luck, your old timing will still be good if you just get the right teeth lined up.
Doing the water pump at the same time may be a good investment. But I'm not sure if you can get it in and out without pulling the pulley off the crankshaft.
