I replaced all upper and lower control arm bushings on my 1990. Getting the control arms off was ok, doing both lower arms then both upper arms. Getting them back into the jeep was a huge pain- the axle moved, and the arms wouldn't line up. This is with the jeep on axle stands behind the LCA body mount, wheels off, axle hanging, officially the right way to do it....... I ended up runnning a chain under the jeep and around a back wheel, second chain to the front axle, jackall in between to pull the axle back into line. Not fun. Some time later, I did the UCA bushings- this time it took a long (4 feet long) pipe wrench locked on the axletube, with a jack under the end of the pipe wrench. Of course, angles available are limited by lots of stuff in the way- took some finess.
That covers UCA and LCA removal and reinstall. The bushings are in a metal sleeve in the control arm. Since I was using polyurethane bushings, the metal sleeves stayed in the control arms and I heated the sleeves with a propane torch (OUTSIDE!!!nasty fumes), then pushed the old rubber bushings out. To get the new bushings back in, clean out the sleeves, then put the control arms in a warm place. Put the bushings in the freezer overnight, to shrink a bit. Lube the bushings with the supplied silicone grease, and hammer them into the sleeves. Poly bushings, properly lubed, make a rubbery sounding squeek every time I go through a dip or over a bump. I should have used OEM rubber, but then you have to remove the old sleeves, install the new bushings with sleeves, if I heard correctly.
The bushings were the same on each end of the control arms. Upper and lower take different bushings, so 2 sizes are needed.