Luke --

It's easier and simpler than you think. (Whadda switch! :) )

The wiring harness unplugs from the switch.

The electrical portion of the switch assembly (which is what you're really concerned with) disconnects from the mechanical portion -- from the barrel 'n cylinder 'n lock stuff -- you won't need to touch the "key" part.

With tiny hands and a tiny Phillips screwdriver, remove the two tiny screws holding the switch to the barrel. You might find an offset screwdriver (or perhaps a Chapman kit) better suited -- but I can do it with an ordinary small Phillips screwdriver.

Try very hard not to lose the screws.

Special words often help.

Reassemble, carefully observing proper alignment of the switch to the barrel (it fits only one way).

This should take you 20 minutes, 15 with the helpful words. I do it all by feel, sitting up.

But here's a thought (question, really). Could a bad engine harness do this?

Has anyone been digging around the fuse panel, perhaps installing a 900-Watt stereo?