lowering the blazer 4x4

Has anyone lowered their blazer thats a 4x4? how far can i go down? i want to keep the 4x4. what will i need? will it be easy to do? i only want 1 in the fron and 2 in the back or 2 in the front and 3 in the back. i know i can just block the back. do i have to lower the torsion bars or raise them?

You just back the screws holding the torsion keys.

Expect a 2 inch front drop when they are removed.