95% of traders lose money, 4% will make money in the short term, and 1% of traders can make a career of it.
Trading institutions invest 100's of millions of dollars in technology to give them the edge. Just as "Financial advisor" states: only invest what you're willing to lose because the institutions have the upper edge and the probabilities are against you.
But all being said, its the psychology that makes or breaks you as a trader... cut your losses and let the winners run. It's tough to do and against human nature.
Are you a 1 percenter?