When you’re striving for quality and efficiency, being thorough and always moving forward is very important. This means the less you miss in every step, the better the end result will be, and the sooner you’ll get there.
In most steps of the body work and paint process, working under plenty of light is important. It is especially important when wet sanding the paint.
Have a lot of light close to the paint. It might seem easy to see everything, but more than likely, there’s plenty of scratches being missed. Even on a bright yellow car, with a lot of black guide coat, it’s not until a lot of light is right on the paint that every scratch shows up.
Like usual, every little thing you can do that marginally better, all add up to the highest quality work in the end.