the right way would be to remove the springs from the rig.
i opted not to(i've done these so many times,i can do them on the rig)
if your SOA,and doing this in the drive, you better have a way to secure you rig.
jack stands.BIG ONES!! that why i bought the 10 ton stands,they go up to 47 inches.if you have a floor jack,that helps also.c-clamps, 1 or 2 big ones.
let go with removing the springs:
1) get yourself a map gas kit(kinda like propane torch)
one at a time heat the spring pins up and the bushings(what this does is char the bushings and makes it easier to remove the pins,on the pivot end of the spring,remember to remove the retaining bolt that holds the pin in place. look you'll see it)
pry bar and dead blow hammer the pins out(this is the hadest part of the whole job) be patient!
go to the shackle end of the spring, remove the one plate of the shackle,and heat and beat,just like the other end.
step 0) i forgot,remove the u-bolts from the axle.
hard to explain, but you need your rig jacked up so the axle/tires are just off the ground, jack stand the axle so i doesnt go anywhere. remove tires
OK step whatever..

now that your springs are off the rig,c-clamp the springs a couple inches away from the center pin.
you will need to bend the spring clamps open that wrap the springs
remove the pin anyway you can.(i cut mine off)
an add a leaf kit will give you new center pins.
back off on the c-clamp so the springs release.
keep them facing the way they come off,they are off-set from center.
with your springs apart, the new leaf should end up being the third leaf from the top of the pak.
use a drift,something other than the new bolt provided to center all the leafs in the pak and clamp them again with the c-clamp.
once they are all compressed and aligned, install new center bolt(c-clamp should still be holding springs together)
tighten center bolt,tighten c-clamp,tighten center bolt,tighten c-clamp,tighten center bolt.
remove c-clamp,install new bushings(grease them up)
install springs
HOPE THIS HELPS!!!!!!
once