Check out the link in this thread at repgeeks for complete disassembly and assembly diagrams from ETA. It is a little amazing. Make sure you check out the adjustments section at that site also. Seeing stuff like this makes me want to try it also, but If I liked the watch at all, I think I would pay an experienced person to do it.
http://www.repgeek.com/showthread.php?t=35267
Link if you don't have a repgeeks account:
http://pugwash.info/eta/7750/7750.html