I agree, there are some bad stripers out there. Don't underestimate yourself. If you were nearby I'd have you come over with some One Shot and a few striping brushes.
There was a "pinstriper" who showed up at a local car cruise to solicit work a few years back, and he ruined a few cars that day. I was waiting for someone to break his fingers so he wouldn't be able to pinstripe ever again.