Gauge the back of the first wall cabinet. Mark the dimensions of the wall with a pen, angle hook and level, so the horizontal lines are level. Find and mark each stud outlined area, with your electronic finder. Mark the positions of those studs on the back of the cabinet the distance of each pin from the lines on the wall. Mark vertical lines from the edges on the back of the cabinet at the same distance.
Due to the weight of the cabinet and its contents, it must be mounted directly on wall joists. In older houses, it is not uncommon for the walls to be leaning forward.
Drill two guide holes on the back of the storage cabinet at one-half foot from the top and bottom of each pin line that is vertical, the top and bottom of each row. Place with all the front of the cabinet. Use your screwdriver if necessary to loosen the screws and stick shims behind backward or to move the cabinet forward and get it soldered. Loosen the screws and shims behind the bottom if the surface of the cabinet is tilted forward. If the bottom of the cabinet is tilted back, loosen the screws and shims behind the top. Tighten all screws.