Just follow the great pictures otto sent you to, and you'll be all set.
If you're planning on owning this Jeep for awhile, I'd recommend pulling all the bolts out, ONE AT A TIME, and lubing them up real good with a quality anti-sieze compound. It'll make the next change (or adjustment) much easier. I had to take all my stuff apart at once, to change out a bad water pump and PS pump, so I went a little nuts with mine...
One note I wish someone had warned ME of, when I did mine last...
Be very careful with the bolts near the top (that pass through the aluminum "frame", into the intake manifold). The manifold is also aluminum, and the threads can strip pretty easily if you really yard on the wrench tightening things back up. I stripped both holes, and had to drill everything out, and re-tap the manifold to a more-common SAE thread. (the originals are metric, and sometimes difficult to find replacements for- depending on your local hardware supplier). You don't need to loosen these just to change the belt, but I "pooched" mine trying to do the right thing, and lubing things up while I was re-installing everything else.
Please be careful in adjusting the initial (or "new") tension- use the "search" function, because the subject has been over-covered elsewhere, and it's where I learned the right way to do this! It really IS easy just to change the belt- just be careful, and look closely at the pictures. Before you turn the key for the first time, look over each and every pulley, and make sure that the belt is fully INSIDE each pully, or all your efforts will be ripped apart when you turn the key- please don't ask how I know how IMPORTANT this is. I've screwed up a few belts learning the hard way.
