Do not remove the trim from the rubber. Get inside the car ... have 2 people outside the car (one each side) and using your feet (socks on) push the windscreen out.
Once glass is out ... you can remove the trim if you want to.
My brother in-law helped me remove the windscreens on my car and no problem ... but I was sh!tting myself ... he wasn't as he has done this many times.
Be prepared though for breakages ... we broke my Alfa Sud one after getting it 99% out.
Glass can be replaced for these common cars ... image trying to remove a 8c2900B's windscreen
Pete
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ps: Remember it's all just opinions

'71 1750 Series 2 GTV: http://www.alfabb.com/bb/forums/showthread.php?p=208078