I was too scared to trim my own but fortunately someone had a beat up pair for sale. They are factory fenders trimmed, and supported with a tube to give it the "tube fender" look. It turned out pretty good. I just took a rattle can to it. All I had was flat black so it shows every screw up and scratch but oh well.
Sorry I forgot to get some good up close pictures before the paint but here they are before paint
After paint... Kinda looks crappy in this one
Comparison to the crappy stock fenders and stupid 6" flares (finally out of Utah law for tire coverage
It didnt turn out too bad. Given that they will get beat up, plus its a JEEP, I dont really care about perfect looks. Body damage builds the jeeps character right?