Don't take the door off!!!
I just wired up my harness about a week ago, and if I remember correctly just open the door. You can see on the inside of the car theres a gromet to pull out then feed the o2 and the battery wires, It's a lot easier if you got a buddy in the engine compartment. Use the tight space between the door and the fender. I had to use a long screwdriver to guide the wires up through the inside of the fender through the door opening at the hinges.If you still having problems feel free to e-mail me and I'll try to help you out as best I can.