I know this is probably simple stuff, but a bit of help wouldn't hurt before I start taking my prized guitar apart.

Just have two buckers wired in at the moment with a coil split, and I want to put a JB in the bridge wired up in exactly the same way. The buckers I've got at the moment are custom jobs from here in Australia and the wiring is the exact same colour as the Duncans so I can just copy the wiring that's in there now...I just have no idea how to take the pickup out and where to thread the wires through etc. etc.