I'm about to attempt my own rebuild this week. I remeber everyone telling me how hard the 700R4 was to rebuild (back in my 3rd gen days) and It wasn't bad at all.
You may need to make a jig or something to hold the tranny (workbend with a hold for the input shaft to fit in. I'm a cheap bastard and also a curious one, so I always try to learn how to do something, so if it ever breaks again, Im that much more familiar with it.
Back in my 3rd gen days, we didn't have the internet and bitchen tools like LS1Tech (yes, I consider it a tool). I have found some pretty detailed T56 rebuild threads. I have opulled mine apart, and the only tools I needed was a Socket Set, Breaker Bar, Torx bits, snap ring pliers and Hammer/punch.
I haven't pulled the syncros apart yet, but they should be be that much tougher.
Syncro kits and basic rebuild kits are available for <$200. Master kits (all bearings and bushings are around $400. Billet keys run aroud $95 and Steel Shift forks run around $50-$75.
Here's a pretty good link to a step by step on LS2.com http://www.ls2.com/forums/showthread...&threadid=1877
There are also free online parts lists and drawings if you google. Or you can buy them on ebay.