The disassembly and rebuilding of MB transmissions are some of the easiest mechanically and some of the most finicky. The valve body is very complicated and problems causing shift complaints can be real difficult. The straight disassembly and reassembly are fairly easy with no real special tools necessary.
The best mechanical manual on MB trannies is the ATSG (automatic trans service group) series. Go to this link and go to the store. The MB manuals are on the second page.