Maybe someone can help?

How would one go about removing their stock stereo wiring to install new stuff? In a '96, are the wires straight from the head to the speakers, or do they run into harnesses along the way?

No thiers an in line amp most likly in your factory system.

But you are in luck ! This site has a wire diagram for your system!!
http://www.the12volt.com/installbay/vehiclewiring/1/yeard/Pontiac.html

Hope that helps

Actually, you just told me what I needed to know. Thanks =)