Let them install it. I did my first one myself and it really isn't that hard using butyl. When I cracked that one I called henderson glass and for $140 they put the next one in and it was a LOT better looking job. They line the outer edge of the windshield with a black primer so you don't see any of the glue or the edge of the windshild channel. I even had them pull my back glass and reinstall it cause it looked that much better.