I am not sure how you came to that question, I think people are amazed at the craft of detailing at this level. If it were easy, then everybody would be doing it.
It is not hard. It is a pretty simple process. But experience goes a long way. Because you can burn through the clear and color if you are not careful. I think that is what scares most people away from doing this.
I worked at a shop that did a lot of World of Wheels, Detriot Autorama and other high end shows. I did A LOT of wet sanding there. Early on I had a couple spots I burned through paint. We are talking lots of clear coats because we knew we wanted to sand the orange peel out. But I learned quickly and was more careful. Way easier to take paint off slowly than it is to add the paint back on. haha
The guys that restore paint on old cars are what are real impressive. You are talking usually very thin paint they are working with. Measuring the paint thickness all over the place and after every process to make sure it isn't getting too thin. Experience and skill pay off big time for those guys.
boats are way easier to do than cars if maybe that's what he was implying?
I would imagine the gel coat on a boat is much thicker and durable than clear on a new car.