There are actually a couple of really good HOW TO's posted on this board and others that show how to get to the CV joints without disassembling your entire axle. You basically need to put one corner on a jackstand while you use your jack to hold the weight of the A-Arm, and you can remove the inner boot and manipulate the joint out of its cup for repacking with grease. From this point you can also access the outer boot if it requires repair or maintenance.

Here's a beginner's tip for easy cleanup: When you repack your CV joint, just stick it in a plastic baggie and squirt a ton of grease in with it. The plastic will allow you to push the grease around and get it all packed in without making a huge mess.

If you have any other specific questions, ask away!