In my experience, the potential problem with this flow chart is the decision point at "can you fix it?" That is the point where things can go south. A decision based on lack of knowledge (you don't know what you don't know) or hubris (I can fix anything) can quickly result in an arrow to "can you afford a mechanic?" or to "you're screwed." Reminds me of the book "Zen and the Art of Motorcycle Maintenance." Choose wisely, Grasshopper.