It is not a Terrible job, but you will hate the MB designers... you have to loosen the power steering pump, the A/C compressor and the alt to get the belts off. the a/c and PS can be loosened from above, the Alt has one bolt that is best accessed from below... three bolts hold each from moving. and each has a tensioner to loosen as well.
you are looking at about 3 to 4 hours to do it all... I would change the ps and A/C while you have them out.
enjoy!
John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!