Yeah you are right this is not for everyone, trading is very hard and not all of the people who do trading has earn it is still depend on the luck of the person who do trading, even a simple buy and hold task is not that simple and not for everyone, because we don't have the same patience the same sight and plan on our investment or trading works so we have also different earnings and loses and trading is not really for everyone.
Trading is not easy but it can be made easy through proper knowledge and experience as well as through utilizing your skills during proper timing. I will say that those who don't find themselves to be able to do trade are those who will always fear to be a part of a successful field and they will never become able to earn huge amounts through their skills and such type of people are just focusing on their job instead of earning an extra amount.
Trading is for risk takers and before taking risk they will surely learn well because they don't depend on their luck but want to earn through their knowledge and skills. One who learns well and knows the facts about trading will become successful traders and their success will only be due to their knowledge and boldness.