I've done this twice now on my car, and it's not difficult. I followed the 110 engine shop manual, a Chilton's manual, and instructions that were printed in a technical article in The Star (MBCA magazine) a few years ago. I can send you a copy of the article if you want to.
It's good to use a new cam cover gasket. Tools needed include a 17 mm open end wrench for the adjusters (I think the techs use a thin wrench, but my Crafstman wrench worked ok), feeler gages, screw driver and plastic hammer for removing and installing the clips, and wrenches to remove and install the cam cover bolts and spark plugs. I turned the engine with a socket wrench on the crankshaft pulley bolt. It's easy to turn with the plugs out. Remember to remove the socket wrench from the pulley bolt when you're done; it's easy to overlook!
John R. Boyce
1983 280SL, Euro, 5 speed