Remove the two Phillips screws securing the fan in place with a Phillips #00 screwdriver.

Use a magnet or a magnetic screwdriver to lift up the screws once they're fully loosened, as seen in the second picture.

Screwdrivers with a black tip usually mean that they're magnetic, as shown with the black arrow in the second picture.

Remove the fan from its socket.

Set the fan's wires free from under the clamp (see the yellow box on picture #3).