You're wrong about the FA part. That's all I'm using. Everybody is expecting USD to rise this year, not just me. The only TA I'm using is looking at previous highs and lows.
Trading can get volatile but I would suggest you to have some stop-loss mechanisms in place to control losses instead of waiting until margin calls. Margin calls should be your absolute last resort and shouldn't be relied upon to control losses. You don't have to put in overt stop-loss orders in case if the broker hunt your stop-losses but just set a stop-loss level in your mind and have the discipline to take out the trade if the price closed above/below the stop-loss level.
You trade a certain market because you have an strong understanding of it and strategy where you have an EDGE, Not because you find it most interesting. You are looking at this industry too much as a curiousity/hobby than a business....
Ok. But I certainly can't close the entire position at a SL that's closer to the price than the margin call. Remember that my margin calls are not 100% of the trade. More like 4%.