You're in luck. There is a very detailed and easy to follow guide on how to do this exact thing over at crvownersclub.com. In short, you'll need to remove the rear diff cover and drain the fluid. Then, you'll need to remove the axle shafts and disconnect the driveshaft. Next, you'll unbolt the carrier bearings and finally remove the ring gear/carrier assembly. Once that's done, you can clean everything off and prep it for reinstallation. To finish up, just reverse the process and fill with new fluid once everything is back in place.