I have a NOS nitrous setup on my tbird. It's fun to use at the track (I won't go into detail about which public roads it's been used on
). The biggest thing you're going to have to be worried about is the tuning of the N20 and fuel. If you're lean, you're going to wreck something. Get your jeep on a dyno (I recommend TecMotion) and make sure that it's safe at wide open throttle.
Start reading here-->
http://www.holley.com/TechService/FAQ.asp?category=NOS. Then go and read every technical paper you can find on the internet. Then go and talk with some people who have actually installed it in an application such as yours.
BTW...it's not NOS....It's NAAAAAWWWWWSSSS!!!!!!