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These guys are making it sound way too easy. There are some things you are going to need to be careful of like dropping things down never to be seen again. I replaced mine a year or so ago and this is how i did it: 1) lift the lid off the back tank and locate the red wire, Turn off the water, flush the toilet and disconnect the wire. The flapper will be in the open position. 2) Take a pick and put it in between the black seal and the light colored plastic door, there is a boss that locates the seal. Go around the seal and carefully pull it up off it’s base, being careful not to drop this gasket, or the tool, or your flashlight down the chute. 3) clean off the mounting flange with a flat scraper or screwdriver, mine was 30 years old and had calcium and other things attached to it. I used a soap and vinegar solution to soak the flange, and i went thru the hole and carefully scraped everything off. 4) take a small cup of water and splash it into the mounting flange to rinse it, you might need to do this a couple times, then let it dry thoroughly. 5) Take the new gasket, peel off the paper backing exposing the adhesive, and very carefully squeeze the gasket into an oval to fit it thru the hole and place it over the mounting boss and seat it on the flange. 6) plug in the red power wire, and the flapper will close. I let mine sit for 24 hours like this before i turned the water back on. mine has been installed for a year or so and i am really happy, a $300 and maybe 15 minutes of my time to fix.