Remote wiring can be tricky, but is do-able depending on certain conditions. One of the most important, is knowing your location. For example, if I was going to do this, your being in London, California, or Tampa, are all different circumstances. Another thing is the guitar itself. A Stratocaster can easily be done remotely. An Explorer, not so much. But, it still can be done, if you did the Duncan Liberator system.
For example, (and I'm assuming a 3-knob Explorer), you'd just need a Liberator, and two more pots. You'd unbolt your current pots, without disconnecting them. Gently move them out of the way. Lay a piece of blue painters tape over the holes, then mark them with a Sharpie from underneath. That could then be stuck to a piece of cardboard and mailed to whoever is doing the wiring. The kind that comes in a new shirt is ideal.
But even that isn't perfect. You'd still be responsible for the pickup wire ends to be tinned and dressed properly. This is where location is so important. If you sent the pickups, controls, output jack, and hole template, it could easily be done as a virtual plug-'n-play, no-solder, installation.
But again, geo location is most important.