I just bought a 91 rs, was thinking about replacing the top myself , how difficult is it ? I have mechanical skills , just never done anything like that before or would I be money ahead to pay the upholstery shop $450 they want in labor ? Also should I go with glass window or plastic ? I would rather have glass but the car will be my daughters 16th birthday and 1st car and I've heard u have to becareful folding the top down with a glass one. Thanks