I agree with industrialfish on that one. Here's some schematics that might come in handy: http://www.autozone.com/repairinfo/r...96b43f80cb3c3a. If it blocks you, just create free autozone account and browse away!
I ran speaker wires because I had the stock unit with no rear amp or wires there. To directly answer your question though, yes it is fairly simple, after removing the door panels and the under trim, pull the boot from the frame side of the door and fish a stiff piece of wire (coat hanger etc.) through the boot and attach your speaker wire to one end. Then carefully pull it through, terminate ends and done! Then routed same as power wire to trunk.
