Load the paint into the sprayer reservoir and make test patterns on a scrap board, adjusting the nozzle (or changing nozzle sizes) to get the proper paint flow and application speed that results in the right coverage (not too thick or thin).
One technique essential to achieving good results when using spray equipment is to keep the spray head the same distance from the work across its entire surface. It may be wise to practice a bit to resist the natural temptation to swing the gun in an arc, which applies the paint unevenly.
Start the paint flow off the edge of the surface you're painting and move the gun at an even speed in overlapping passes. Release the trigger only after the gun has passed the opposite edge of the painted surface. Apply paint in several thin coats.
Spraying corners requires a slightly different technique from that used to spray flat surfaces. Always spray the corners first.
If you're spraying an outside corner (above left), stand directly in front of the corner and apply the paint in short horizontal strokes. This will put a thin coating of paint on the adjacent walls, but painting the walls will even it out. Don't wrap the spray pattern around the corner on either wall.
If you're spraying an inside corner (above right), move the sprayer in one continuous stroke from top to bottom, releasing the trigger at the end of the pass to avoid paint buildup at the bottom.