Newbie offroader...Read this.

[stagger_lee]

Depends on how crazy you are going to get. Basic recovery gear is definately a necessity. You can use a high lift jack as a come-along, but wont do much good as a jack unless you have good solid jack point ie: winch bumper, rock sliders. You can also get that tire strap attachment to use with the high lift, but I have seen them used and its kind of sketchy. This thing looks cool for helping you get unstuck:
http://www.jeephorizons.com/news/arb_xjack_111205.html

Here is a good check list from that same xterra guy. He is very thorough.
http://xterra101.com/trailgear.htm

Unless you are a mechanic, a little more than the basic tools would be sufficient. Think about what could break, if you are carrying spare parts, and what tools are needed to make the fix. Ratchet tie straps are great for all kinds rigged fixes. I have a breaker bar for lugnuts (i dont like the stock tools) We have done the 2x4 as a splint on a cracked frame with a ratchet strap around it to get us off the trail. Then again we probably wont be cracking frames on the H3, afterall its not an FJ.