Your nail or screw must be slightly tilted upward to hold the clock tight to the wall. Nail should only be sticking out of the wall approximately 1/4". ** For large designs, a screw should be used and needs to go into a wall stud. A standard nail will NOT support this heavy design. Do not hang the clock above head level. Insert a new, fresh battery from the package. This is best accomplished by putting the positive (nub end) in first, followed by a firm push to the negative end. Check to make sure the positive end of the battery is pointing down and the silk ribbon is not obstructing the connection between the battery and the mechanism. You may need to slightly pull on the silk ribbon to ensure the battery is making full contact with the mechanism. Set time by using the dial on the back of the mechanism.Make sure the mechanism itself is vertical so the pendulum will swing properly (considering some clocks are asymmetrical and may need to be slightly tilted to one side or the other to achieve proper balance). Make sure the swing arm is not hooked to the side post on back of mechanism. If so, gently push it to the left until it unhooks. Carefully place pendulum on swing arm hanger. Place clock on nail/screw. Be certain the hanger and braces are flush against the wall. Enjoy!