Starting from the SIM slot side, carefully peel the back cover off of the phone.

The back cover is very flexible, but you don't want to damage any internal components by being too hasty.

There is a chance that the NFC coil may remain stubbornly adhered to the back cover. If that's the case, stop peeling the cover and reapply a heated iOpener to the back cover.

Do not separate the back cover entirely; it is still connected to the phone by the camera flash cable.

The flash cable is attached on the power/volume button side of the phone.