Probably one of my favorite trails in Moab. There's difficult obstacles, however there's always a bypass option if your vehicle can't handle it. There's a stunning look out of the Colorado river. On a clear day you can see for miles and miles. Bring plenty of food and water; these trails can take longer than expected.
I highly recommend picking up "Guide to Moab, UT Backroads & 4-Wheel Drive Trails" 2nd edition
by Charles A. Wells
This book gives you a very detailed description on navigating through all the trails in Moab.
Awesome awesome awesome trail!! Hell's Revenge is one of the most famous and popular trail for off-roading in Moab, UT and if you have a suitable 4x4 vehicle, I definitely recommend it! There are obstacles on the trail that are optional and can be by-passed such as Hell's Gate, Escalator and Tip-Over Challenge but even not doing those difficult/dangerous parts still makes this trail super fun. I've done it now twice in my modified FJ Cruiser and it is such a rush diving on that sand stone and getting to go over 30 degrees up and down and even drive through some of the hot tubs!
Potato Salad Hill is a nearby obstacle to the trail that many people ion their extremely modified rock buggies will do and tipping and rolling on this obstacle are very common occurrences! Do not attempt without extreme confidence in what you are doing or without a spotter if you aren't sure.