From watching the glas pro guy do mine I wouldn't tackle it on my own. The removal of the trim pieces perhaps, but not the windshield itself. You have to first remove the plastic trim pieces that are on either side of the windshield that go up half way along the roof. This requires breaking the plastic clips that are underneath it. You'll also need a new black rubber trim piece that goes along the top of the windshield (~$10-15), the guy was actually suprised how well it actually held it's shape after removing the old one and said he could reuse it, but I had already bought the new one and figured might as well.
To get the windshield itself out you have to cut through the cement that holds it in. The service manual shows this being done with piano wire, but they had a razor blade setup which seemed to cut right through it pretty well. This was the part that kinda of got me unsettled. Then once the windshield is removed they have to scrape away all the old cement, and that stuff will hold anything... I have a tube of it now. The new windshield cement has to be heated up to at least 200 degrees before it will flow properly and it has to be spread evenly and quickly, they place the new windshield on the car and work it in to the proper position then put the whole thing back together. I would think if you didn't get it just right you'd probably end up with air leaking through the outer edges of the windshield.
