I had a new windshield professionally fitted last week. Happened to look out of the window just as the guy was prying up the centre piece with a flat prying tool, similar to a screwdriver. He just seemed to be prying upwards from the roof side of the surround. I couldn't watch the rest of the procedure after that, but I'm pleased to say everything was put back in place perfectly with no damage!

Seems to be a fairly simple process but for peice of mind may be worth getting a windshield shop to do it for you, as suggested above!

GL, Andy.