I tried searching for killswitch and not much came up. Can anybody help direct me to a good thread? How bout a wiring diagram for this thing?

Trying it out on a cheap guitar first:

Ibanez RG120

I've watched a bunch of youtube videos, it looks like one kid just wires a switch to his output jack, without touching any of the wires that were there, and somehow it works.... is it really that easy?