It is possible 99% of traders lose , internet evidence shows 95 % of traders lose.It maybe as much as 99 % lose due to psychology.
Psychology is 100% of trading success. This is because the human with a mind is going to execute the trades and a trader’s brain command center makes all the trading decisions.The brain’s command center can shut down due to stress responses , in the middle of a trade. Emotions can override rational trading rules, systems and methods taught by educators.
If the trader's brain command center shuts down in a stress response , all the technical stuff is useless and worthless. The mind of the trader controls his success.
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