Bullet, I didn' t want to put you off undertaking the job of replacing your dashtop but it' s best to be prepared for some of the things that may or can go wrong.
Nick' s method of removing the screens is fine but unless your windscreen seal is relatively new then I wouldn' t advocate putting the same one back - especially since they' re not that expensive anyway. So' if you' re not going to re-use the screen rubber I find the easiest way of removing the windscreen is to cut through the seal all the way round the screen with a Stanley knife.
It' s finding a good (undamaged) replacement used dashtop that' s the problem.
Andy
' 69 911E------------>R