Quote from Laissez Faire:
For the average guy, the difference between being glued to the screens and the jobs you mentioned is that even mediocre performance on average or bad days at work still gives you a steady paycheck.
In order to excel in a normal life job, I'd say you need a combination of dedication, interest and possibly talent.
Another huge difference between succeeding in any other profession is that the knowledge and the 'what to do' is usually public knowledge. There's no such thing in trading. Half the work is just getting started and learning what to focus on.
I may very well not succeed as a day trader, I'm well aware of that, having spent thousands of hours glued to the screens both live and backtesting data. I know what I'm up against and it's a different picture than the snake oil vendors are painting.
But maybe you disagree?
So "mediocre performance on average" is acceptable to you. Over time, I'll bet the boss would disagree. Moreover, YOU KNOW what it takes to excel. "Bad days" and failures will and do occur no matter what your performance level.
As for knowledge, you have described a holy grail. OCHLV+LastPrice is the public knowledge of the market, and one or more of those variables form the basis of ANY "what to do" in the market. If you can't find or develop a successful method you are comfortable and confident with using one or more of the public domain variables, all that's left is luck.
Good luck to you.