Trading is a complicated subject which is not able to bring profit to everyone. Just as there is a history of gains in trading there is also a history of losses. Successful application of knowledge skills and statistics and successful application of control is a prerequisite for success eliminating all types of mental instability. See everything in life is difficult if it is associated with unattainability. But there must be a plan in trading and it must be in a controlled way because if there is no control in the profit plan it will make us lose.
I prefer some support from the prerequisites that you say because the prerequisites before starting something more risky must be understood by people who want to carry out trading in the long term. Because when you are just starting out, it is always difficult to achieve a greater profit except for just a few percent as a better start, so having knowledge and mental control which is sometimes mixed with emotions is very important in order to be able to continue trading quite comfortably without hasty decision.