They have shelving systems at Home Depot, Lowes, etc that are quite easy to install. The hardest part will be the installing the doors so they line up correctly. You will need screwdrivers, a level (very important) and a lot of patience. My biggest piece of advice is making sure the floor is level before installing. If not, it is worth the extra effort to fashion a lower sill that is level, screwing this into the floor, and installing the doors onto it. If this happens, make sure the door are the correct height for the new, smaller opening.