First off i would have someone trace the cutout and location from an original car. I would mask off all around the template, drill any holes first then drill the radius corners. Use a small cut off wheel and dremel/die grinder,would probably do it inn strokes first score it through the paint and work around, deeper with each stroke letting it cool before coming around to it again. Biggest thing i would worry about is the paint chipping. also when your done touch up the edges with paint so it doesnt rust.