Easy..depending on how professionally it was installed/repaired over its life.

The hardest part is removing the stainless trims without bending them, or stretching them out of shape. This involves putting WD40 on the seals where the stainless is, letting it soak in, and using a small screwdriver to loosen the dirt/silicon used to hold the trim to the rubber, while carefully extracting the trim off the rubber.

To remove the windscreen, I generally carefully run a straightblade screwdriver between the window and the rubber on both sides of the window. This loosens up the glass/rubber bond from silicon, and "UV damaged rubber" from sticking to the glass.

Then I get in the car and using running shoes (soft bottomed) I sit in the seat, push it as far forward on the rails and them place my feet on the windscreen and push it out. If the seal is old, there's a good chance it will split.

Having a spare seal is a great idea. Then you can remove it like professionals, where they run a sharp knife around the window rubber and cut it out so the window can be easily popped out. When dealing with glass and pressure, always use as much surface area as possible when pushing it in or out.

Never lever the glass out with a scewdriver...NEVER!!! You will have nightmares of the vision and sound of the windsceen shattering in slow motion...

The other problem is getting the window back in if the seal has hardened. The use of the 4mm nylon rope is the go, but the rubbers need to be able to accomodate the string plus the thickness of the glass during the operation.

Chris