Just like what the others have said...you need to know your limitations. I love my KJ, wife calls it obsessed. I seem to work on it a lot more than any of my other vehicles that I have owned but I wheel this one so you do have ot pay to play...within reason. Mine is a 2002 Limited with roughly 125k miles on it. Issues to day...1-window reg, 1-transmission valve body(factory defect) and 1 jacked up air bag sensor clip (my fault, but seriously WHO PUTS THE SENSOR AT THAT ANGLE?) LOL.
I take mine when I go wheeling, hiking, geocaching, hunting or target shooting. It has gone places that I never thought would be possible without a much larger/more modified vehicle. All in all it is a great Jeep, IMHO. Do I beat the hell out of it, my co-workers would say yes but they get a new car every year or two max (Seriously). I have no problem plasma cutting, welding, moving and or changing nearly anything on it.
If you have owned Jeeps in the past then you know you have to do a bit more maintenance on them then other vehicles. But you can do a lot more with them.
Best advise, Join L.O.S.T. KJ forums

chances are if something acts up on it, one of us has either located a repair for it or has fabricated something to upgrade it.
Welcome aboard and don't worry.