Trading is not easy at all is what I have known in trading. You can make money today and lose tomorrow. Not just that a trader just lose at times, the trader will later see his mistake and said to himself that I know this and I told myself I will avoid the mistake anytime he wants to trade again but he do it again. I have experienced this very well. Just trade with little amount of money has been the best way of trading.
Exactly there is absolutely no trader that doesn’t make mistakes, the most successful traders today are one of the best losers because they learn from there mistakes, if it is technical analysis error they simply backtest over and over again to actually correct there mistake. But if it is a psychological mistake it is mostly hard to correct because, sometimes just like you said this mistakes are usually predicted by the trader themselves before falling into. That’s why it is always best to trade every time with an amount you can afford to lose and make use of stop loss even when your analysis seems perfect to you.