I'm in the middle of doing that right now. I'm going by the pirate article written by BillaVista. It's very thorough and dumbs it down pretty well. In the end, it's not that complicated (more so than a 9" though) it's just time consuming and tedious.
I'll be done with it this week in preparation to swap my axles and when it is done I'll probably have 5-6 hours just in setting up the gears not counting the rest. Just for kicks I called BaerTrax on Friday to ask how muck they'd charge me to do it. Keep in mind, mine is completely disassembled and all they'd have to do is set up the gears. He told me $250-300, no thanks.