Don't panic I know how you feel. It's probably just the switch, but even if it's not its not bad to repair. In my case 420SEL one window needed a switch; one needed the plastic slide for the mechanism plus a little dressing up of the aluminum track with a small file, and everything is OK. The more you work on it the less scared you'll be; you'll get confidence. It's really a fine car, no matter it's age.