Choose the proper size wood screw (typically a #8, 10 or 12) to fit the hanger at the top back of the clock, and long enough to go securely through the wall into a stud.

Secure the screw into the wall, angled upward at a 45 degree angle, and hang the clock.

Open the front door and hang the pendulum on the hook (on many clocks the hook is behind the dial), give the pendulum a swing, and the clock will start ticking.

Move the bottom of the case to the left or right until ticking is even (or if there is a beat scale beneath the pendulum, move the case so the pendulum points to zero when at rest).

Secure bottom of case to wall so clock is stable.