John,
I would like to point out that this is not the appropriate section of the forum for this type of inquiry. Replacing sheet metal is a specialized skill that requires a significant level of technical expertise and experience.
Because this work is complex and goes beyond standard DIY procedures, there are no simple tutorials available. If you are unfamiliar with the fundamentals of the process, I strongly advise against attempting to cut out rocker panels, as this can lead to serious damage for the vehicle. I would seek a professional shop.