I took a couple of wrong turns. I think it was only after the fact that I realized that it was puzzle solving that was a key motivator.
It would seem that you could know yourself so well that what will provide job satisfaction is obvious or you could try different things until you find something that "fits" are the two approaches.
The process of troubleshooting is one that involves an analysis, an assessment of likelihood to prioritize possibilities, and conducting experiments to see if a problem can be specifically identified and corrected. Electronics is better than medicine because if you guess wrong, people generally do not die.