It's pretty easy on the drivers side (I believe) there are two plugs they use a 3/8" ratchet to remove. The bottom is drain the top is fill. Basically take out the top so you don't get a vacuum take out the bottom to drain. It takes a quart. Reverse procedure and fill with fluid of your choice, just make sure it has the limited slip additive. Get a hand pump to transfer the fluid into the diff.
All this is obviously while the car is properly raised and supported by jack stands.