What timing. I just changed all the belts on my wife's '83 300 SD yesterday. But had to put on a new alternator, so it came off anyway. As for the others, you can loosen the mounting bolts and then loosen the adjustor bolts. No need to remove anything. The way I learned this is by taking them off and then realizing that it was not required. I'm at work and cannot go pop the hood right now, so cannot give you a blow by blow description. If you haven't gotten the job done by evening, I'll take some pictures and walk you through it. Good luck.

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John Schroader
bio burnin' 83 300D, '83 300 SD, '79 240D
"I've never met a man who was good at making excuses who was good at anything else" Ben Franklin
"You cannot permanently help a man by doing for him what he could and should do for himself" Abraham Lincoln