cherokee's are UNIBODY designs, so body lifts are NOT APPLICABLE.
check out
http://www.rustysoffroad.com for suspension packages...
your suspension is all coils (no leaf springs) so installation will be pretty simple... just some basic hand tools, breaker bars, and a SPRING COMPRESSOR (rentable at pep boys and autozone)
check out my website for details about my XJ lift install:
http://www.dingus.tqhosting.com/[addsig]