Once you have opened the case completely, you will be able to see the front and back facing cameras.

With your tweezers, carefully lift the cameras out of their place. the cameras are held together by a ribbon cable. Be careful not to damage the ribbon when pulling the cameras out.

Now that the speakers are out of their place, you will need to disconnect the ribbon connector from the circuit board.

When all of the previous steps have been completed, you will be able to install the new cameras into your device.