As others have stated, disconnecting the inverter cable from the power supply first is NOT the way to go. I ended up damaging the cable trying to get it out before I went to disconnect it from the LCD panel end instead. Much easier to do and much less prone to damaging the cable or it's insertion socket.
The guide needs to be updated and the suggestion to pull the inverter cable downward from the power supply removed. It is not a good idea and will cost you at least a few days and $10 to replace the cable should something go wrong. Please update this guide.