<i>"somebody who (like me) knows quite a lot about psychology..."</i>
I know a little bit about that field myself. It's interesting to see the same human flaws = characterisitics = traits demonstrated in all fields, all walks of life across all levels of income and net worth.
There can be a monumental difference between potential profits and realistic profits in trading. The more complex a method or approach, the wider that gap usually is.
One thing to look back in history, be it thirty seconds ago or weeks ago and see where all the correct trade decisions were. It's quite another to see correction trade decisions <i>at the time of action or more importantly, just before time of action beckons</i>.
Complexity kills in this profession. We are taught that more is more. Problem-solving skills are developed to assimilate massive input of data to arrive at correct conclusions. Weigh all the evidence before deciding.
That concept may work in a court room or scientist's lab, but it fails miserably in trading. Intelligent people naturally lean on their intellect as a protection mechanism. In trading, they tend to create a rocket-science approach. The fewer people who can understand it, the greater likelihood of its existing edge. If so many people are failing at a task, the obvious reason is they aren't looking at enough information. Pile on more data until the intellect can solve the latest puzzle.
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Sooner or later, truly successful traders realize more is more. There are some amongst us here who can look at a naked chart, nothing but price bars and use that info to make consistent profits. Drawing tools and indicators only make it easier to measure price action. Too much of that clouds the picture.
One of the mistakes experienced traders avoid is complicating things. Always try to see price flow clearly and with least deliberation possible. Most pros have very plain charts. Most aspiring traders have very messy, cluttered charts.