When I did Nathan’s lowers, I just supported the lower A arm with a floor Jack and knocked the BJ out with a sledge. Three good hits and it was out. To install the lowers, I pulled the boot off the new BJ, fitted the correct press tube, jacked up the A-arm an inch or so by the press tube and whacked the lower A-arm downward with the sledge, using the Jack to force the BJ up into place. Three good whacks and it was in far enough to install the clip. On the uppers, I used a cutoff wheel to remove the shaft of the BJ right at the ball. Once it was off, I put a receiving cup on top and just pressed the joint up with just the swivel end of the press tool right on the ball to press out. Pressing in the tops, I used the “normal” process. There was a tube that fit the uppers with the boot removed. I installed the upper boots last thing. Took a couple of hours on the first side. About an hour on the second side. Learning curve FTW.