Read up a chiltons or haynes manual. Ball joints arn,t hard to change but a small press helps. First you remove the tire, then the hub, brake rotor. frt axle and disconnect the tie rods. The ball joints are pressed in plus held on with a large nut and cotter key. The first time I did mine I took the parts off and did not have a press so off I went to the Jeep dealership with the 2 knuckles. They charged around $100 labor. The next time on another old cj the local auto and tool supply house had a special on a small hydralic press powered by a bottle jack. So I bought that instead of giving the dealer more money. It is also useful for U joints, etc. It does require quite a few tools and you must be careful when using a press because you are exerting a lot of force to break the joint loose. At the very least safty glasses are a must.