Ohhh Psicology! The hardest part to learn!
My humble advice for new traders is to start with little money... bc the only way to learn how to handle your emotions and be disciplined is by blowing up a couple of accounts (and you probably will!). Its not the same with demo account, when real money is on the line and when it hurst is when you really learn. FX is marketed as an easy way to get rich overnight but it seems that the mayority of traders, especially newbies loose money.
So be disciplined and dont get greedy when you have a long winning strike! Thats what kills account. Keep your leverage low and you will be able to go to sleep at night with a loosing position opened.