I'm not a professional yet, however from my experience so far, the best way I can suggest to keep your cool is to get good at online poker, specifically HeadsUp. Start at the lowest stakes and work your way up to Midstakes. Once you successfully make it to that point you will have learned all the psychology you need and a whole lot more that is directly transferable to Forex. You'll probably learn it faster too.
If you're American that may be hard with the recent issues online. But there are some rooms open or you can play live.
If you're American that may be hard with the recent issues online. But there are some rooms open or you can play live.