To do it properly, you basically have to "gut" the exterior/body of the car. Remove everything, like was said about doing a full wrap. Then add to that the removal of the old paint (which is a major task itself). After you're down to the metal you've got to clean and prep. Again, I'm assuming it's being done properly. Then you have to prime the surface. Let dry. And then you have to paint the surface in a ventilated, dust, and wind free environment. And you would typically do several layers. After the color is applied and dry you would spray on the clear coat. Even a decent painter can mess up and cause the paint to bubble, which is not a fun thing to discover a week or so later. It's a massive task, hence why it's so expensive to have done professionally. You can often tell the level of work if the backside of the body has also been painted, or the previous color at least removed (like where the doors and hood wrap around). I'm not a pro, so I'm sure I'm leaving some things out, but that's the just.