Pick the areas for the different parts of your computer system. For instance, the modem should fit in a bottom cabinet for quick access. Doing this before installing the system allows you to drill the holes. This is necessary to allow the wiring to slide back behind the Hoosier cabinet.
Attach a wood auger bit or wood saw to your power drill. Depending on the size of your wires, use a bit or hole saw that cuts a hole no larger than 3 inches in diameter. Cut the holes in any areas that require electrical cords to go through the back of the Hoosier cabinet. Ideally, the holes should be near the base of each compartment to hide the holes with the equipment.
Clean up the sawdust with a hand-held vacuum or a vacuum cleaner with attachments.
Position the computer equipment in convenient areas. Place the computer screen and keyboard in the main compartment of the Hoosier cabinet. If it has a slide-out shelf you can put the keyboard on it while working. Depending on how often you use the printer, place it in a compartment where it can be reached quickly and that allows you to refill the paper or open the lid when necessary.
Push all the electrical cords through the holes you cut. Plug the cords into a power strip.