Used a stanley knife and a guitar string to cut the rubber seal around the window. Got 3 sides done nicely, but on the fourth could not get the knife blade in properly nor the string all the way through; no matter what angle, how hard or how many times I tried. Eventually stabbed most of it away using just the tip of the blade. Lifted windsheild out and as doing so watched an existing crack grow and grow. So, as there was no point in being carefull now I eventually wiggled free the windshield you see below.
Also disconnected the headlights and indicators.