I hada replace the one on my first car as some stupid bag secided to smack the screen right where there was a chip. Replaced with a screen from a scrappy and broke the first one trying to remove it.
A long bit of string, some fairy liquid or wd40. Some thing slippy. After you have the rubber around the new one, wrap the string from one corner the whole way round. Over lap where you started right up to the other side. Grease it all up.
Set the bottom of screen onto the lip of frame. You will need to people. Make sure you keep the string tight. Start pulling the string along the length of the bottom rubber, pulling towards the middle of screen at all times. You should see the rubber lifting up and over the metal, the other person should at all times be pressing the scteen into the car, and not leting it move in any direction.
Do this the whole way round. You may want to pull the other end of string and work both ends around at the same time. Try to finish on a flat rather than the corner. May take more than one attempt.