Here is the FSM:
Mercedes Service Manual Source, CD/DVD/Paper
The main thing to watch out for is how the flex disc is oriented in regard to the seating into the flange. Here is a thread that will help explain:
Flex Disc Orientation, safety and durability issue.
When I did mine, I don't recall having to jack up the transmission. If you raise the rear end, with the suspension dangling, you should have plenty of clearance to remove the propeller shaft. However, if your working on ramps, you may have a time getting the shaft to compress enough. Personally, I would never jack on the transmission pan as I don't believe you can get away without bending/distorting it to where you will have constant leaks. It uses a rubber seal that I don't believe will hold up to jacking.
Grease the fittings is probably referring to where the raised boss of the flex disc inserts into the flange. If you don't apply a very small dab of grease, you may have a very difficult time of ever removing them the next time.