I had broken spider gears in my carrier that had to be replaced and I did it in my garage. It was mentioned earlier to make sure the shims go back in the right place and you need to make sure you have good contact between your ring and pinion. Otherwise, you'll be taking that sucker apart again...
We have a group going up AF next week, so if you can't find anyone to go with you are welcome to hit it up with us. Also, if your intrested there will be a few of us out at little moab tomorrow around noon.