I would say that the best way would be to get employed in the industry, talk to people, assess companies., learn it from the inside out. I did this, rather than blow all my money as a new day trader. A side benefit is that you get paid to do it and can make friends and network into opportunities.
Approach hedge funds or asset managers (a drawback is that you may need an elite degree or at least a CFA certification but may be able to get in based on networking or sales ability to compensate for a lack of this- or go back to school) and ask for a role (even in back office). Offer to work in sales, or to work your way up. You will learn more about how real professional investors work that way than any other. You would be surprised how many small hedge funds or asset managers exist. You will also be surprised how different it is to the BS you will read/ get sold for the retail investors. I saw a really truly stupendously dumb seminar once for retail investors ...the secret, apparently, was support and resistance levels and 'letting trades run'. It cost £10k and some 30 people actually paid up (now that was a good risk-free trade - £300k gross profit). No professional money manager works that way. This strategy usually works in a (expensive to live in) financial 'node' like London, New York or Connecticut so you may have to move.
Side note: One of the posters here had a $7500 training package. That would pay for a CFA and CAIA along with all the study material. You could always get work as a low-level analyst.
Also, while you do this...you can test your ideas with a demo or small account to see things in action as a side venture.
Professional money managers take all shapes and sizes. Some are 'human only' with small or large teams, others are quant based and high in technology. Some are high frequency, others are event driven or have longer time frames. They also trade different asset classes equities, ETFs, commodities, derivatives etc.
Another point, test your IQ. It by no means the only factor but a contributing one. Mine is just under 140 (which puts me in the top 1-2% of the population). No amount of hard work can make you smarter - it is permanent. I am not as smart as a lot of people in finance and know my limits.
You will find many of the top fund managers are genuinely smart (often, but not always, verified by academic degrees or certifications). If you were not it would be like going onto a basketball field with Michael Jordan in his prime at 5 ft 2inches tall. Theoretically possible but highly unlikely. At the highest level, of course. There are always mediocre companies but they rarely shine.