This is a cake-walk job.
- lift Jeep by frame and put on jackstands, (if you can't get it high, take your wheels off)
- put a jack under the axle and raise it till it just supports the weight of the axle.
- remove bolts for sway bar (lower) and lower shock bolts
- slowly lower the jack holding up the axle. It will drop low enough that the springs should fall out.
If you have a spring compressor, its a bonus - ESPECIALLY for tall springs. If you have an auto, you might have to remove the tranny skid plate or else it will catch the front drive shaft, preventing it from lowering far enough (again, spring compressor is nice). I was able to put OME 4dr HD coils in mine without removing the skid plate or the track bar. I used a compressor though, just because I had it. Not sure if I needed it. You can rent them REALLY cheap.
Total job was just under 2 hours for all 4 springs with the right tools. My coils replaced a BB, so I already had shocks on.
'07 JK 2dr Sahara - auto w/ 4.10's and rear locker. 2" OME HD coil lift, BDS shocks, and 1" body-lift. 34" Hankook RT09 MT's on 16" AEV Bridgers. ARB diff covers, Warn bumpers, Warn 9K winch, a couple Hella lights ...and a WORTHLESS AirRaid CAI.