I'm no electronics tech, but soldering isn't rocket surgery. Four CTS 500k audio taper pots, Switchcraft 3-way and jack, a couple caps (I don't put much stock in bulltique caps, personally), and some wire. About 50 bucks. Don't overcomplicate it. The Epi stuff wears out - mine did after 3 whole years of light use. That said, my guitar didn't get any better due to the new parts; just solved the scratchy pots and dodgy 3-way. I didn't expect a sonic improvement; it wasn't a reasonable expectation. It was simply a repair project.

I got the parts from http://www.guitarnucleus.com/gnstore/elec.html - reasonable prices, good service.