I had a friend of mine who traded KOSPI. First year made 20% on about 100k and he thought he had it down pat. He was using a simple automated MA strategy (tunnel method), guess what, he got chopped up in two months (beginning '05) - 35% drawdown. I would talk to the guy and tell him to hang in their during that period (but inwardly I thought what a fool for sticking to a strategy that is not consistently working). As his losses grew, he stubbornly clung on (because his 4 year backtesting told him this period was an aberation and "sure to end" any day).
Point is that you need a consistent mindset and strategy, something that takes time to develop under a range of conditions, which might not neccessarily be what is going on since you started trading. You've got to survive long enough to figure out what is going on.
In other words do your homework, invest in a good data feed, take time out and learn more and more (learn everything) rather than jump in and eventually you will know when you are ready, you will have few questions in your mind.
Personally I feel the best approach with currencies is "mechanical discretionary" - not trading like a robot, but seeing a 3D market for what it really is, a place where the biggest sharks have "graduated" to from S&P etc. because of virtually unlimited position size. Do you think that such participants will consistently be on the other side of your position? When you do, go ahead.
Sincerely best of luck to you.