Best to follow the paint manufacture's recommendations, but usually you have one person roll the paint on and have another person tipping behind and then you continue through the entire project (no coffee breaks) so that you get a "wet" edge throughout the entire hull. Best to put several thin coats on rather than one thick coat too. If you stop in the middle of the project and go back later to finish it up, you will see where you left off and where you started again, so do the "wet edge" thing. Also, paint on a day when the wind isn't blowing dirt if you are outside and don't paint late in the day if outside as any late afternoon or evening moisture will dull the shine. And, of course, the best outcome is done with the preparation. If you are painting over a previous paint job and it is in relatively good condition, sand it so that there are no shiny spots. You don't have to sand it all off if in good shape, or unless you are covering it with a more aggressive paint (like Awlgrip over an Alkyd). Then you need to put an epoxy primer to barrier coat the old paint from the newer aggressive paint. Good luck.