I don't agree that traders fail because they don't put work or create detailed plan, they do but because it doesn't work out doesn't mean they don't but what I believe is that it is a process of learning and mastering of trade takes time. Trading is not about detailed plan but you must have the confidence and emotion required for trading and if you don't have control over your emotions then you will struggle for more longer time.
Trading takes time, you can be a trader within few days, but it takes months or years before you will understand how to use trading to make profit consistently. The mistakes of the new traders is emotion, using by high margin ratio, quiting because they do not risk low and not having a backup plan in case of losses (a kind of plan to minimize the loss or that can finally result to profit). But some people will trade and later realized that trading is not for them as they will continue losing and if they do not stop, loss will continue. Some people just have to prefer holding than trading as they re still losing after many years of experience.