When you refinish any type of cabinet, you get better results by removing doors and hardware before proceeding. Remove drawers from desks, cabinets and other furniture.
Put down drop cloths, and tape any surfaces where you do not want paint drips.
Use a quality, grease-removing dishwasher detergent in water. Wet a rag, and wring it almost dry. Scrub the surfaces that you plan to paint.
The laminate finish on these pieces is too slick for other paint to stick. Use 100-grit sandpaper and a hand sander to remove it.
Any dust left from sanding causes a rough finish for the primer. Remove the dust before you prime.
Using this kind of primer allows you to paint with any paint you choose and have good results. Apply the primer with a disposable brush, eliminating the cleanup. Allow the primer to dry per the manufacturer's directions.
The particle board is ready to accept your favorite color and type of paint. Apply two coats, using a brush for larger flat surfaces, and a foam brush for hard-to-reach corners.