If your front end isn't already well below stock height, you shouldn't have any problems if you're just adding a leaf in the rear.
I added that 3/4 ton suburban set, with custom top leafs, lifting the back from about 4" below stock height to about 5" above, and I have no problems.
Also, if you're just bolting on the bottom leaf, you don't even have to dissasemble your shackles. just pop the U-bolts, remove the center bolt, and watch out when the lower 3 leafs try to smash into you.
If you're running stock springs, you should be able to put them back on by hand, otherwise just fit it with some U-clamps, and pop the center bolt back through.
(someone correct me if i'm horribly mistaken)