Adam~
I had to post in here, as privaete messages limit the # of characters allowed.
I too am uneducated and normally learn from blowing things up and destroying everything in sight.
There are two wires on the 12V and they are not well marked.
I belive the grey is power and the white is ground. I would have though opposite, but it wasnt the case.
Yes, my access route was through the little rectandular cap that pops out in the bottom of the center console. I was able to hide both wires fine, as they will both run undreneath the center/gearshifter and power will extend underneath steering column to the the fuse panel.
The adapter does not come with enough wire to ground or run power to, so you will need crimp on extensions and run them accordingly.
There are multiple places you can insert a fuse tap and get power and any local automotive store will carry fuse taps, but I recommend Napa. You will have to get the small type of fuse taps as they will be used in association with a mini fuse.
I too have read others tapping into the existing power and ground of the OEM 12V, but I have been trying to stay away from doing these things to the OEM stuff, so I dont mess it up.