The rear wouldn't be hard at all, just need some shorter springs, bags and shocks. With the solid rear axle the camber won't change.
For the front, in addition to the same things as the rear you'll need a solid fabricator to cut things up, weld them back together and reinforce them to get the camber correct.
And none of that takes into consideration what the suspension will interfere with on the frame or body at that height.
In other words, nobody here has done it and 3rd gens are not a good platform for lowering. I'd recommend getting a truck that's been done before unless you're a world class fabricator. But if that were true you wouldn't be asking how to do it.
Whatever you do, good luck.
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