Device for hanging objects on a vertical surface and a method of using the same

A hanger assembly having separable surface and object brackets that can slidably engage in a nested position without fasteners. The nested position is formed through the engagement of opposing channels of the respective surfaces of the surface and object brackets. The surface bracket has marking tabs for impressing on a vertical surface a selected orientation of the object that is connected to the object bracket, which in turn is nested with the surface bracket. Once the vertical surface is impressed by the marking tabs, the surface and object brackets can be un-nested and the surface bracket mounted to the vertical surface with the guidance impressions left my the marking tabs. Then the surface and object brackets can be re-nested for installation of the object against the vertical surface. The object is not limited to pictures or panels, and can be irregularly shaped articles.