Indeed, even seasoned pros got burn trading future forex contract all over the world.
The "problem" in forex, like gold and commodities, is that it is basically a zero sum game (will not grow in value other than against inflation the longer you hold it). Big trader can manipulate the market for commodities, but gold and forex are strategic monetary tool that sovereign nations use for their advantage. I do not think too many traders have enough influence against short term irrational behavior, or currency wars, between various nations.
It is like poker against someone with unlimited chips, regardless of how good is your hand you will never win.