I've been investing my own money for 20 years, and investing others' money for 10.
I do agree that most with substantial assets are better off trusting a professional or several and paying them.
If you've got limited funds, you can either stick them in an index fund, or else keep them in savings while you do a few month's worth of reading and following the markets. Read books by / about Ben Graham, Buffett, Soros, Icahn, Peter Lynch, et al, find a few companies with solid fundamentals, open up a discount brokerage IRA / Roth account, and add to it every paycheck. Try to max it out each year. $5k put into a retirement account with $400 added each month over 30 years will yield you close to a mil if you average the 10% the markets have over the last 50 years.
Don't quit your job to "invest" unless you come into millions or more. You won't be the best investor ever, and you probably won't make the 20+ % Buffett and the others have made over many decades. And the more you listen to hacks, trade in and out of positions, etc the more likely you are to committ financial suicide.
