I am probably showing a bit of vintage with this...but.....
when I was a youngster you would always buy a Gregory's S&R for your car. It showed everything about how to virtually pull the entire car apart, how to service everything and then how to repair or put it all back together again. They were must haves in our house. We had one for the EH, another for my VB, one for the LH Torana. A Gregory's was always the third thing we bought - buy the car, buy a tank of petrol so you got home (in those days second hand cars were almost always sold with little more than vapours in the fuel tank) and on the way home pick up a Gregory's.....
Is there anything similar for the 2015 Mustang?