An apparatus and method enhances installation of a waste disposer mounting assembly at a drain-received sink flange. The apparatus comprises a carriage guide, a carriage assembly, and a spring-actuable notch stop. The carriage guide comprises a hooked end, a handled end, and a notched face extending intermediate the hooked and handled ends. The carriage assembly is translatably and cooperably associated with the carriage guide and comprises a centralized rail guide aperture and a plurality of fastener-engaging arm assemblies. The guide aperture is sized and shaped to receive the guide rail and the notch stop engages the notched face for selectively prevent translation of the carriage assembly relative to the carriage guide. The arm assemblies of the carriage assembly carry a mounting assembly via fastener-port engagement to a mount position where a snap ring fastener may be manually installed to prevent downward displacement of the mounting assembly from the mount position.