How hard is it to replace an InSinkErator garbage disposal?

Replacing an InSinkErator garbage disposal is a moderately difficult DIY project that most handy homeowners can complete in one to two hours, provided the existing mounting assembly and electrical connections are compatible. The difficulty depends on whether you are replacing with the same brand and horsepower. InSinkErator uses a Quick Lock mounting system, so if you are replacing an existing InSinkErator with a new InSinkErator, the job is much easier because you can often reuse the existing sink flange and mounting ring without removing it from the sink. You just twist off the old disposal, disconnect the dishwasher hose and electrical, and twist on the new one. If you are switching brands or the old flange is damaged, you will need to remove the old sink flange, which involves loosening the mount from under the sink, cleaning off old plumber's putty, and installing the new flange with new putty, which adds time and mess. Electrical work is straightforward if you have a plugged disposal. You simply unplug it. If it is hardwired, you need to turn off power at the breaker, disconnect wire nuts, and reconnect. Plumbing involves reconnecting the discharge tube and dishwasher drain hose. The hardest parts are working in a cramped under-sink cabinet, lifting the heavy disposal while aligning it, and dealing with old corroded fittings. If you are not comfortable with electrical or plumbing, hiring a plumber costs 150 to 300 dollars for labor.