The motor mounts on this car is a piece of cake. You have no problem jacking upthe engine on the oil pan with a piece of wood. Loosen the mounts, support the engine remove the bolts, jack up the engine, remove the mounts. Installation is the reverse.
By the way, an excellent manual for maintenance and repair is the Haynes MERCEDES-BENZ 190E manual. You can get it at Pep Boys, Auto Zone, or Trak for 12.95. It has a lot of procedures illustrated. Don't buy your parts there, buy them here. They will come quickly, the quailty is excellent and you will be charged a fair price, if not the best price.
1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T