This is where I remind you to remove the faceplate before going any further.  In fact, you should have disconnected the power from the negative lead of the battery before even starting this whole process, but since I knew I was not actually going to be doing the whole assembly, I decided to forego showing all of that because I wanted to enjoy my music while taking these pictures.  I should not that you could either ruin your head unit, ruin your whole car's electrical system, or injury/kill yourself and possibly others by failing to turn off the power to the vehicle before doing this.  Please, be safer than I am! ;-)