Read this on how to take the hub body off.

Replacement snap ring for end of axle
Snap ring pliers
PB Blaster
Hammer and brass drift to beat the cone washers loose (rest drift on hub body, and left the nuts on, so the washers don't go flyin')

Pry bar for the cussing action after you disconnect the flange at the differential.

Pull CV axle out from the inboard side.
Reverse to install.

If the boot has been torn for awhile, you're better off lugging it to the parts store for your core exchange up front. With steel prices going batschidt, they've gone up another $50 on my end of the planet. <img src="/forums/images/graemlins/evil.gif" alt="" />

If buying a boot kit, you'll still need to buy the end snap ring seperately.

You can also buy one of those split boot deals to slap on there after you dig out the grease and rocks from the joint and repack them with molyb grease.

As mentioned, your call; mostly depends on how long you've been driving it that way.