1) Get a really big container
2) Fill container with paint
3) Lift boat
4) Dip boat in paint
5) Lift boat and let dry
6) Repeat as needed for multiple coats
See, it's easy!
(Yeah, the mini-roller on a stick is one way. You can also drill out the center of those wooden "foam brush" handles and insert a tight-fitting dowel... works like a charm and it's incredibly cheap... like me.)