Depends on your ability to read, IMHFO, in this day and age, there
are two tools you can't do without.  An FSM, and a good code scanner.
I have about 30 FSMs, One for every vehicle I've owned, and have saved
cubic dollars repairing my own stuff over the last 25 odd years...

SteveL

The problem with computers is that they make people lazy and not want to
think.  If you take your car into dealership with a minor problem all the
mechanics do now days is start wholesale replacement of parts until they
accidentally get the right one.  Own your car long enough and you will know
it better than the so called factory trained experts that work on it.  A
factory service manual will go a long way in helping you get on top of the
learning curve.  Even if you don't work on the car that much you will at the
very least be armed with enough knowledge to know the difference between
someone giving you an honest diagnosis and a smoke screen.