STi Steering Wheel removal
More docs here:
http://www.seccs.org/tech
It's really not hard. Just make sure the battery is disconnected and you stand on the pedal a while to discharge any power in the circuits.
When pulling the wheel off (if you don't have a steering wheel puller), leave the steering wheel nut on loosely while yanking on the wheel so you don't punch yourself in the face when the wheel comes loose. I've had wheels come off easy, and I've had wheels require gorilla like yanking to come loose.
The clock spring is what resets the turn signals when completing a turn, as well as being the wiring pass-thru for the horn and cruise controls. The instructions for lining everything up is written right on the spring unit, just follow them exactly. You don't want to break the spring the first time you turn the wheel more than 90 deg.
Edit: Also, if you're wearing out the top of the wheel, stop driving like a gansta and start putting your hands where they're supposed to go.
