To be a good trader you need to do research and prepare yourself according to the advice of expert investors. You should initially choose the currency and buy a minimum amount to get a good idea of the market situation because when you have your own investment it will be easier to do your research and you will understand when you should invest and when you should withdraw.
From what I am thinking, to become a good trader you need to have someone that is an expert so that he can teach you step my step. If there is no one to teach you how to trade you will make enough of loss. But when you have an experience trader that will show you good strategy on how to trade successfully you won't lose compare to when you are just starting trading alone without any assistance. Trading if for people that are ready to lose their money because from what I have read about trading it is 50 50 thing, and that means the trader is not sure if he is going to profit from the trading or not.