Feeding the wire through the fire wall took the longest. If you youtube how to pass wires through a 2011 f250 theres a guy that shows you where to access. Not very hard. All you have to do is pull up the carpet and pull the rubber plug. A trick that I used was that I drilled a hole into the plug and fed the selector out of the hole. I tied wire to it and pulled it up next to the fuse box. I did this so I didn't have to drill a larger hole for the selector.