He's right.
Pull the PCm towards you and the spring clips on the bottom edge closest to you will disengage. There's two pins in the back that slide out of thier holes at the same time. Sometimes the spring clips hold on for dear life, so you may have to frig with it a bit.
Then unplug the wire connectors.
Some do the wire connectors first.
Your choice.
One final word of advice:
Wait for daylight to do it.