Power Windows

I have a 68 convertible with manual windows. I know Bair makes a complete kit to convert to Power Windows. The question I have has anybody out there done this is how hard is it. My main concern is having to drill new wholes or does the regulator and other parts fit in the same wholes as the manual windows hardware. There something about me getting around a fiberglass body with a drill that worries me.

first i would ask Bair. They should know if you need to make any modifications to make the switch over. the door panels are different as the switches are on the console unless this kit just uses door mounted switches like in other GM cars.