if you have a buddy, then all you have to do is disconnect the swaybar end links and remove the shocks.............
that will let the axle droop far enough and you can replace the springs by hand........some prybars or spring compressors make it a little easier if you can't get them in.
if you are alone, then you can do the same but you WILL NEED the spring compressor, or put a jack under the front axle and disconnect the upper control arms at the axle end. then slowly lower the axle a little bit until you have enough room to swap out the coils.
also........if you are either replacing the trackbar or installing a relocating bracket, then disconnecting the trackbar will make it even easier.
WATCH OUT FOR THE BREAK LINES AND DIFF BREATHER TUBE....if you lower the axle to far, you can brake those.