Windshield Install/Remove/Clips/Details

How much risk is there in the windshield breaking due to age? I was looking to attempt this but the local glass shop said it would be RISKY because the glass would be SO brittle being on a 74 model car. Even said it may cost 4x as much since they will need to be extra careful.

Thoughts?

It is easier to break older windshields, the glue layer between the glass dries up and they get less flexible.

But charging 4x as much is BS.