Replacing a doorbell is one of the easiest home upgrades you can make. The wiring is low voltage and the whole job takes under 30 minutes.
Turn off the breaker. Unscrew the two mounting screws and pull the button forward. Take a photo of the wires before disconnecting anything.
Feed wires through and screw the plate to the wall. Connect wires to terminals — polarity doesn't matter on most doorbells.
Attach the doorbell to the plate. Restore power. For smart doorbells open the app and follow setup steps to connect to Wi-Fi.