Trading is not easy, but it is possible to make money if you know what you have to do. For this discussion we will assume that we are talking about daytraders, not investors! When a daytrader starts to trade live for to make a living, it is normal for everything that he/she has learned up to that point to fall apart. This will happen for several reasons, which we will probably get as many answers as traders, but it really happens due to one obvious reason, which is not so obvious! I think it best for now that traders try and come up with the answer, not for a guessing game, but it will make them think about what they are doing, and when the answer is eventually out in the open, and I am certain that some traders will get it, it will then become obvious why this very important pre-requisite to trading is so important to success. However, knowing what is required, and knowing how to do it correctly, are not one in the same (that is actually a hint if read correctly).