Here's how to do it assuming everything's old & crusty & stuck.
Good frames are getting scarce, and most of the bottom corners are rusted out or very fragile.
The act of dissassembly is enough to break the corners
so try & go easy.
Pre-soak the upper corners with a good penetrating oil.
Each upper corner has 2 screws on the side & 1 on the face. Take your time with oil and a new screwdriver tip and try to save the screws as they fit better than the new ones.
At this point run a single edge razor blade (in one of them little blade holders) under the glass all around to help release the seal. The holder will allow you to cut deep with less chance of an accident.
I use a length of wood laid flat on the glass and tap the upper channel off starting with the corners.
Be aware that each upper corner has 2 L shaped tangs firmly rusted inside the channel. If the penetrating oil doesn't work, try a little heat from a propane torch and just tap, tap.......going real easy...
Be carefull to keep the channel straight as you tap it upwards.
Try to NOT bend the sides outwards, but rather slide the glass up and out of the frame. Penetrating oil soaked into the bottom and side seal might help release it if she's super stuck, together with heat & the razor blade.
*Tip...observe how well the old glass fits, does it appear too big? ...too small? If it fits well, that's your best pattern to make the new windshield. Good luck with it.
...or what?
