The best way is to trade with the money you can afford to lose. If you are trading so that you can pay for your bills, then it is tough to take out emotions out of trading. Only play with the amount which if lost won't make a difference in your life. People who are full time traders are professional enough to keep emotions out of their work. But part time traders usually for FOMO and panics.
and not set aside also that you cant have the chance to make it back the money that you have been lose for cause there is always a possibility that you can make it again back as long as you believe for your self that you can do anything.