After I installed my 3.5" superflex kit I came up with these hints:
1) Spend a little extra money and buy an adjustable traction bar. The RE instructions said to drill a new hole 3/4" inboard of the existing hole on the axle. Not only is it hard to get the exact spot to drill and drill it staight, but when you are done there is only a small amount of metal between the two holes and any significant amount of stress will cause the bolt to break through and wallow out causing you to weld it and drill again.
2) When replacing the front springs, jack the jeep up high enough to set it on jack stands on their highest setiing under unibody frame rails. Put a floor jack under the front axle and jack up the axle as far as you can without lifting the jeep off the stands. Remove the tires, front shocks and the traction bar. Disconnect the front sway bar and do not remove the upper and lower control arms. Now lower the jack and front axle. The control arms will keep the axle centered and the axle will drop down far enough for the springs to fall out. No spring compressors needed.
3) I also needed 3/4" spacers for the transfer case because my u-joints were binding.
Good luck