I can't solder for crap either. I'd show you pics of my soldering, but I didn't take any.
BUT, doing the phantom power mod isn't that hard at all. SERIOUSLY.
If you're worried about soldering stuff, practice on something that doesn't matter. The EASIEST thing is soldering two wires together and that's all you're doing. If you want, buy some extra bridge rectifiers, practice soldering a wire to one of the pins. The rectifiers are like $2. Each one has 4 legs. You need 2, buy 3, and burn away at each leg on the spare.
It's really hard to mess it up. I was intimidated as well, but I just jumped in with both feet & went for it. It worked. Haven't had a problem since. I thought I had a problem, but it works now, and it has since.
How do you get to Carnegie Hall? PRACTICE!
How do you get good at guitar? PRACTICE!
How do you get your FCB phantom powered? PRACTICE SOLDERING!