We ship everything flat packed to you. Shelves are connected to side panels using a cam locking system. Units next to each other will share a common side panel. All hardware installation is done with a regular, phillips head screwdriver. Drawers come fully assembled to make for swift installation. If you purchase a hanging module, you’ll first want to install the 2’’ x ¾’’ solid wood french cleat on the wall using a stud finder and power drill.