Just did this job about a week ago because the vacuum hose to the fresh air flap vac diaphragm over on the passenger had broken off, and I'd found the vac hose with firewall grommet, "laying" in the wiring harness for the glovebox compartment light.
It was a pretty tedious job because my paint is nice and I was worried I would damage the cowl or hood paint. The wipers were a challenge, because their splined connections were a little corroded. I wrapped a big bath towel around the base of them, sprayed up into them with Kroil, and used a dental pick tool to pry the little metal retainer clip (at the spline connection) out of the way. Then it was a matter of prying, and leveraging.
With the wipers off, I removed the 4 little screws on the front (facing the engine) edge of the cowl. Then it was a careful balancing act of keeping the cowl from scraping into the back corners of the open hood, and getting pins along the back of the cowl to come out of the windshield panel. Maybe it would have been easier with the hood completely closed, but I left the hood open. That may have been a mistake. Anyway, I was able to get it out, and repair the vacuum line.
