Ben
When I fitted my side windows in the sport, it took 2 of us, as Tim says. The whole assembly needs to be put together first and one person pushing from the outside, with a cord on the inside. I didn't put any sealant on mine because of the mess it makes, and haven't had any problems. I used a mixture of water and detergent as a lubricant to help it go on. You might already know this, but the thing to remember when pulling the string on the inside is to work it in a circular motion. That way it tends to lift the rubber, and not cut it as it can do if you do a straight pull on it. It takes more time but makes a better finish.
Dave