The torque converter should have the drain on it, they stopped putting the drain on it about 2000 when they went to the Touchshift shifter.
The bolt to rotate the engine is 27mm hex. Later on they went to about a 17mm allen head, maybe that's what Brian is thinking of. This should still be a hex head. It equals abour 1 1/16" or so.
The transmission is refilled in the usual location, down the dipstick tube, but there is no dipstick IN the tube, the dipstick is a tool which has to be bought. Only thing to keep in mind is the trans level is checked at 80 C, which is supposed to be monitored via the shop computer.
Yes, by all means if you do it, you have to get the fluid from MB, it's quite expensive, about $17/qt.