Some techniques for painting interior walls and trim include using a brush, a roller or a spray gun. These techniques all require differing degrees of experience and aptitude for various levels of difficulty.
Painting with a brush requires a steady hand and comfortable grip at the base of the handle. The brush must be dipped in the paint halfway and then lightly tapped on the lip of the can to remove excess paint. The brush is the top choice for detail and trim work.
A paint roller must be rolled in a tray of paint and over the tray's ridges to make sure all excess paint is off. Using a cross-roll approach on a two foot square area gives the best coverage. The roller works best on walls.
Using a spray gun requires practice and keeping a consistent distance from the wall, as well as overlapping each pass.