It is very difficult. Be careful. The metal is very thin and they are easy to scratch.
I placed the molding in the interior of the car first and then rolled them in place. I used a screwdriver to slowly lift the molding metal up while I rolled the molding forward. You can see the molding is over the windshield hump at the end. I am slowly working my way toward the center of the car. It might take you several passes to get the molding over the windshield frame hump. Don't try to get it over the hump the first time. You will bend the metal.
After I got it over the hump, I had to hit it to move the molding toward the center of the car. Do not try to use the self tapping screws to pull the molding in place. You will bend the molding. Use a rubber hammer to hit the molding where it is not shiny. Use a wooden block if needed. A wooden block will spread out the forces of the hammer so you will not dent the metal.
Patrick, Your header molding argent silver is not correct. Original reference is here: 68 Convertible Windshield Header Moldings Other originals I have for reference are the same as the link. Moldings can be difficult to install. The GM ones I have do not require any tools for installation, just hand manipulation.
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