It's harder to text....but, there's threads here that give detailed instructions...including step by step pictures, etc.
I think you should search for t-bar adjustment and reindexing, and shackle installation.
I assume if you are mechanically inclined enough to make your own shackles....this project should be easy.
On the X, the stock shackles are 3" eye to eye.....so, to get 1.5" of rear lift....the new shackles need to be 6" instead. (1" more shackle length gives 1/2" more lift, etc...)
TJ's Build Thread
2001 Xterra SE, 2003 V6, 5 spd, Shrock Sliders, Bumpers and Skids, Warn 9.5xp Winch w/125' MasterPull II, OBA w/4Gal Tank & 4 CFM Compressor, Revolver Shackles, Deaver 3-Pack + Calmini 2-Pack + OEM Leaves, Bilstein 5150, SLR UCA, Diff Drop, 3" SL, 2" BL, 33x13.5/16 LTB's, Snorkel, Electric Fan Swap, etc...