I agree, I couldn't weld that good and was really nervous about diving into the whole rocker replacement thing... When I got in there I found the cab floor edge gone and part of the kick panel missing. By the time I finished one side I thought " And I've worried about doing this for so long.. what a peice of cake" It's just metal... Cut it out and weld solid metal back in.
Dive into it! cut those rockers out and replace them, you'll find out its nothing you can't weld up and grind down. I put my project off for alot longer than that.. Even sold it once and bought it back a year later. Word of advise, don't sell it because your worried about repairing the rust... Give it a shot and fix it