To OP:
If you sat around poker tables long enough, you were exposed to certain "personalities" that have a similar pattern of behavior. You can identify their thought, habits, and their game. What you probably noticed, is that you have amateurs who play against all the rules of logic and still win(not for long). Then you have those who appear to have "no game" and walk away with everything, and at times you have those who play for fun and walk away when their bankroll is done. You could probably name lots of personalities you came across.
In the market place, they are all under one price and line. Trying to figure out the behavior of all them under one direction is your challenge. You are not playing against one table but a thousand. Single player versus crowd.
This thread points to a lot of similarities between Poker and Trading and I do not want to repeat what has been said, but essentially poker is similar to trading because they both have an element of odds and psychology. Intuition plays a considerable role in Poker in figuring out your opponents, but as you know, strategy comes ahead of everything and acting on a hunch alone will lead you to collapse, and the same is in trading.
As you start trading, keep score of your trading. There are many tools out there, and I am sure you can find plenty, but I genuinely like this one:
EdgeWonk You will gain a full insight into the way you think and operate by looking at your numbers objectively.
Above all, best of luck!