300sd belt replacement tips?

[mister2]

I just became a new owner last month. 1985 300sd that I got for a song. Runs great but the hot NC summer makes me want to fix the A/C. The guy I bought it from said the A/C worked but he took off the A/C belt to improve fuel mileage (yeah right). I've turned the A/C pulley and it spins very easily. When I spin the A/c with the clutch it spins but not quite as easily. I've bought a belt to put on and a couple cans of refrigerant. It already has 134a connectors, so I assume it has been converted. Anyone have any advice on putting the new belt on? I haven't even tried yet but I've replaced belts on many cars before. I just want to know if there are any tricks or unseen bolts/etc. By the way, this forum is very informative. Every car I've owned before had a forum and the backyard experts provide way more advice for the DIY mechanic. Looking forward to many more miles on my MB and saving $ on fuel.