The windows on old cars aint to hard to get out, with the use of 2 screw drivers, you need to push the sealing rubber outwards from the inside, its quite hard to get started, but once you get a little bit pushed out it gets a lot easyer. If the screen is chipped though, it may well crack.

The scuttle will need to be replaced, pattern items aint to dear and the rust on the bottom of the pillers will proberly go through once rubbed back, so you will have to patch them too.

Main worry of the job is not to burn the dash board when welding the new scuttle in.

Hope that helps