The first time I changed my ball joints, I didn't know about this forum.
I took the Mounty in for an alignment after I bought it. They called and said they could replace the ball joints and do the alignment for ~$600. I said don't touch a thing, came got the Mounty. The alignment tech said the LBJ's were nearly impossible to change without a special tool, the torsion bars were dangerous, I shouldn't do it myself, bla bla.
I went to Oriley and bought two ball joints, the cheap ones. (which was stupid looking back) I used a hammer and large sockets to remove the LBJ's, pressed them in using a jack like I mentioned. The first side took ~2 hours because I had to figure out what parts to remove and not to remove, the second side was done is much less time. I learned the hard way how to do it, so when it came time to replace them after Moab and ~35k miles, I decided to do this write up to save people some time.
After I did the ball joints the first time, I found out about the press kit from AZ, so I got it for this job. I'd say it made it easier, but this time around the ball joints weren't nearly as tight in the LCA. Now I can blow apart and reassemble the whole front end in a matter of hours.