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Not to bad if you have the tools. You need to get the correct socket which I think is a 32 or 33mm socket but look it up for sure. You will want to just replace the axle its way easier and better all around cause the CV kits don't always work. Axles will run you about 75 bucks at napa. Get a haynes or chiltons manual and follow the steps should only take you about an 1 to 1.5 hrs for a first timer.
pretty easy as long as you are mildly mechanically inclined and have the proper tools. The axle nut WILL be a bitch if you don't have air or a gooooood breaker bar.
clicking when you turn is the biggest symptom that and wheel bearing grease all over the inner fender well.
its not wheel bearing grease.
if the boot is already cut and leaking dirt will get into the joint and ruin it, first it will just start clicking but can eventually fail all together at which point all kinds of fun shit can get fucked up.