if you are buying a factory wire-harness from the a stearlership then it comes with very easy to follow instructions. its not hard to hook up but there are a couple spots that are a little bit of a pain to run the wires and hose through, but still fairly easy.
edit: i helped my dad do his is how i know. i will contact him tomorrow and see if he still has the instructions laying around somewhere (which im almost sure he does). if you are planning on wiring this up yourself without a pre-made harness, i can scan and email you the instructions if you like.
03 Wrangler with some goodies! and more to come