A resting device assembly for supporting a person during a procedure includes a resting device and an armrest. The resting device supports the person during the treatment and includes a device frame. The armrest includes an arm support, a frame bracket, a frame pivot, and a support arm pivot. The arm support supports an arm of the person. The frame pivot connects the frame bracket to the device frame, and allows the frame bracket and the arm support to concurrently pivot relative to the device frame. The support arm pivot connects the arm support to the frame bracket and allows the arm support to pivot relative to the frame bracket. In certain embodiments, the two pivots of the armrest assembly allows for improved adjustability of the armrest. As a result thereof, the person is more comfortable during the manicure or other procedure.