I think to be a professional investor they must be ready to accept any form of risk in the future because to the fluctuating price movement one must be able to think positively in the search for profit and not too selfish when experiencing problems both small and large.
Risk management is time management and most of us fail here. We fail because we're not able to manage our time properly. We fail in time related plans then we can't make our trades accordingly.
When we be able to manage our time, the risk will be less.