By getting the exact same model...I didn't have to redo the sink top part as I had no leaks! Yay!We just unscrewed the old broken Disposal and attached the new one.(After finally maneuvering & getting the 2 screws loosened.)*We could not get the 2 screws loosened where the PVC pipe inserted into the side of the Disposal...So, I loosened the ring on the PVC pipe itself and shimmed pipe out sideways, to have leverage to get the 2 screws out using a ratchet once out from under the sink.A regular screwdriver did not work. From the start, the grooves cut into the screws were VERY shallow and no type of screwdriver would stay in, to be able to turn them at all. (This was the most frustrating part of self install.) TIPS ~ So be sure to have the right sized ratchet.*For support to catch the old unit and prop up the new one...I used a Gallon Paint Bucket with lid on, to slide underneath disposal, so it didn't drop down and fall and break to anything or hurt my hand. It was a perfect fit to support under disposal. ;-)I think I could have installed the entire new Disposal had the 2 stubborn screws been able to unscrew! (I'm a female) I had to get my neighbor to come help me finish up. He couldn't get the 2 screws loose either.So, I showed him I had loosened the side PVC pipe, and to shimmy it out sideways once the metal ring was loosened on top of old disposal using a Screwdriver to loosen ring and drop unit down on top of paint can, then to finally pull it out from under the sink and work on it on the floor.Otherwise, it was super easy to replace and inexpensive to not have to call a professional. :)