no you don't need to remove the springs. you just need to drop the axle to full droop, maybe unhook the shocks, so you have enough room to fish a ratchet and channel locks into the spring.
there were two styles in some models, but ZJ front's will fit in either way. ZJ front and TJ rear are basically exactly the same. Some TJ's got a smaller cone shaped front, but the diameter in the cup where installation is concerned is the same. So ZJ front's from a junkyard will fit TJ front and rear. don't get poly jounce bumpers...stick with the stockers.