All you have to do is loosen the sway bar bolts. You will be able to pry the control arm down enough. I did my RCX 2" this week and it was pretty easy. No need to touch ball joint, tie rod or upper strut bolts. If you undo both sides before you attempt to install the blocks that will help as the sway bar is connecting both lower control arms.
Love the look of your truck BTW. They have to be the best factory wheels GM has ever come up with.