Unless you have an aftermarket cover with a drain plug you have to take the cover off. Just put a drain pan under there, remove the bolts and let it rip. Check the magnet on the diff cover for any large pieces of metal (it should be just a small amount of metal shavings) and clean it off, and clean off any old gasket stuck to either surface.
To refill it you need 2 quarts of 80W90 gear oil (it takes about 1.7), a new gasket and some RTV for the gasket. No limited slip additive needed for yours. Put the RTV on one side of the gasket and stick it in place, then put it back together. Tighten the bolts in a star pattern like wheel lugnuts. Then remove the filler plug on the side (it should come off by sticking a 3/8 ratchet head in there and turning, unless yours is different). You need to fill the diff until the fluid is at the top of the fill hole and starts to dribble out. It may be helpful to use a turkey baster and a little length of rubber hose to fit over the tip of the baster, there isn't much room to work under there. And wear some rubber gloves, not good work gloves, gear oil stinks like hell.
I think that's pretty much it.
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