I just finished replacing my timing belt and water pump today. This was my first time. I would say it might take longer than 5 or 6 hours. The biggest problem I ran into was getting the crank pully bolt off. That was a serious pain. My 550ft/lb impact wrench wouldnt touch it. I broke several extentions and sockets using the breaker bar as well.

eventually I had to use an acetalyne cutting torch to heat the bolt up and break it loose.

Getting the belt on just right was a bit of a pain as well. You have to line up the crank and the cam gears just right. They kept turning on me as I tried to put the belt on. And yes you do have to take off the side engine mount to get the timing belt on. You might have better luck taking the mount off after the auxiliary belts are off.