Since you're lifted it will be (somewhat) easier. You need to fabricate the brackets that come off of the crossmember and locate the axles (beams) side to side. Also extended radius arms, or drop brackets for your current radius arms too.
You're on your own in terms of measurements. There was someone offering lift brackets for 4x4 hardware, with 2wd crossmembers but I don't remember who it was or if the project ever even got off the ground.
If you're not mechanically inclined enough for a leaf sprung SAS, fabbing up brackets to fit 4x4 ttb stuff to a 2wd frame is definitely beyond your abilities.
Though that's not really a good way to learn this stuff. I suggest doing a Dana 30 swap with leafs. Yeah 35's are a little on the big end for a D30, but if you're currently 2wd and don't do serious wheeling and keep the diff open it should be fine until you get more skills to put something bigger under there. D30's are fairly affordable compared to other axles and have a matching bolt pattern.