For a CPU fan replacement, which is the most common replacement, remove the three black 3.0 mm Phillips #000 screws from the singular fan.

For a GPU fan replacement, remove the 5 black 3.0 mm Phillips #000 screws from the twin fan setup.

Then peel off the very strong tape that seals the fan vents.

After removing the fan and inserting the new one, follow all of the steps in the guide again in reverse order.

While following the steps in reverse order, make sure not to forget details such as the replacing the thermal paste and reconnecting all of the wires and ribbons.