If it's anything like the one on a '91 300SE it's a pain. Have to remove a good deal of the front of the engine.
Radiator, fan, pulleys and tensioner, etc. Get the CD if you don't have it already. The only tip I have is the AC compressor didn't need to be removed. As always get your parts from our fine hosts. You'll be surprised but the OEM parts you can get here are the same or cheaper than what you can get at your local store.
'91 300SE sold
'92 190E 2.3 sold
'06 Mini Cooper S
'08 Triumph Rocket III