You need a heavy duty soldering gun for the ignition wires or you'll end up with a cold solder joint.
List of wire locations---> http://db.tt/HWwaJctT
Most wires are located at the bcm. Here's a picture of what you'll see and that's where most of the wires are at (such as drivers door trigger, factory disarm, lock and unlock wires). I just did this on my 2002 grand prix. So I'm hoping this info will keep you from being frustrated like I was. Testing every single connection in the drivers kick panel is a pain (the specific information I needed wasn't readily available so had to spend lots of time testing wires). Also get a test light which kinda looks like a screwdriver but with a sharp needle like tip at the end (don't use it on airbag wires and data wires!!). This way you can probe the multiple colored wires at the bcm (example: door unlock wires when probed will actuate door lock so you will hear the lock. You basically are grounding the test light to the chassis and completing the circuit. This is faster and easier than a digital multimeter!). Also use trunk release at the switch in glove box.
BCM-->
Big connector on the right not the little one to the left.
This is passenger door trigger location (not drivers door trigger)--->
Trunk release relay for negative trigger---->
Any other questions just ask.
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