We had a '77' 450SL that I changed the clutch on. I drained and removed the radiator, and anything else in front of the compressor, maybe the horn? Best I can remember.

I borrowed/rented the Frigidare pulling and installing tools from NAPA. You must do it from the underside and I had it up on a rack. I changed the hoses and belts at the same time. That was done around 1985, just before we sold the car in 1993 I replaced about all the components including the compressor.