put the truck up on jack stands.
Take the wheels off.
for the front...
Disconnect the shocks, tie rods, sway bar end links, lower ball joints.
Get a ball joint puller and pop the lower joint out.
Jack up the lower arm to get the spindle out of the way then SLOWLY lower the arm to get the spring out.
Do the opposite to get the spring back in.
For the rear....
make sure the leaf springs are at full droop
disconnect the shocks
Loosen the spring plates, the bolts that holds the leaf springs on, and the shackle in the back both top and bottom.
Get the springs out and put the "U" plate on the top of the springs and re connect everything.
Put the longer shackles in place of the stock ones.
OR LOOK HERE