I have never written a tutorial, so, if I do one for this, it will take me a few days.
bearauto: Didn't take much to figure out. I had opened my controller, drilled a hole for the switch and was ready to solder, I had my meter out and I was checking if I had the right points when a thought came to me, "if this bunch of wires comes all the way from the Xbox console, I wonder if they go any further". So I just started checking for continuity, I knew ground had to be there, and when I found that the yellow wire was there also, I thought "why not just mod the memory card instead". That is pretty much all there was to it.