EDIT: @enox beat me to it!
You have to remove the kick panels. The junction block connectors are stuffed into the drain pockets (another reason not to fill them with rainwater from the drains). I would recommend pulling them out, but not unplugging them; the terminals will thank you later.
I always remove the seats when I work in the front area, it takes 10 minutes and you have so much more elbow room. YMMV
I removed the A-piller trim because I thought it would expose the chase the harness and drain tube uses to get from the roof to floor. It doesn't; don't bother with it. You do have to drop the front corners of the headliner though, and that requires removing the grab handles, sunroof trim ring, rear view mirror and sun visors (be careful with the sun visor wiring, the connector is stuffed in there too far and it''s really small). You can (carefully) pull the corners out of the A-pillar trim.
This assumes you have a '95-'97 80, and not a '91-'94 model. The early models used a glued in place headliner. AFAIK, they will not come off without damage. I haven't been game enough to try my '94, I just removed the body bolt from the fender to open the drain pocket.