Just did mine yesterday. Broke the Water Pump Bypass trying to get it out (took me nearly 1.5 hours and it finally had enough of me prying and hammering and wiggling and twisting...). Cost me $97 from a friend at a dealer to get the new part. But it is back up and running.
Did water pump, pulleys, belt and tensioner. Wasn't a bad job, but when I broke the bypass I was starting to wonder if I should go farther. The old belt (135k) looked in fantastic shape, so I was really thinking about leaving it in. But once I got back going it went pretty well. Not really for a novice mechanic, but if you are VERY careful to make sure the cams and crank are all lined up to the marks, it is hard to mess it up, you would have intentionally move the cams or crank to hurt it.
Line up it up, and don't move it, R&R belt, put the marks on the belt in the right place (mine was marked correctly) and you are golden.