1. Remove the door handleand remove it from the room, because the two screws fixing the handle are inside.
2. Press the outside with four fingers, press the inside with your thumb, and remove the screw with a screwdriver. When you are about to remove it, press it firmly to prevent the spring inside from accidentally popping out and hitting yourself.
3. After removing the screws, slowly take off thehandle, then use open pliers to open the snap ring on the handle and take out the handle.
4. Insert the new handle and fasten the snap ring.