this is all from memory...
p/s belt is really easy. loosen the two mounting bolts, then tighten/loosen the wingbolt to increase/decrease tension on the belt. once it's at the tension you're looking for, tighting the two mounting bolts.
the a/c belt is a bit more tedious to work with if the p/s stuff is in the way.
there are two bolts to work with here. one sits horizontally, from the idler pulley (the one pulley on the a/c belt that is not attached to anything).
loosen that bolt. then, the adjusting bolt sits vertical to the mounting bolt. there is a locking nut on it so you'll want to loosen that and then tighten/loosen the bolt until the tension is where you want it to be. tighten the locking nut, then tighten the mounting bolt.
that's it. if you can get your hands on a helms manual, this will be much clearer.