Long ago when I got my first "platform" I had put on a few trades and was getting the hang of things. Entering trades placing stops and setting targets, everything was going well..... Then one day I bought a currency, At that exact moment (I don't think I lifted my finger from the mouse) some news came out and prices dropped 150 points ($1900.00) hit bottom, then bounced up maybe 50 points. By the time I figured out "this is real" prices fell again. I think there were daily price limits on currencies back then (200 points as I recall). Seconds felt like hours and my tiny account was taking a serious beating. I kept HOPING but prices NEVER came back, I dumped the trade and was out over $1800.00 on a one lot!!!
Since that day I always use a hard stop.
Nowadays when I put on a trade I enter a strategy. In that strategy is a stop, entry and target. The stop is preset at my maximum $ risk level. Once the ENTRY is filled I immediately move the stop toward the entry price (a S/R bar or parabolic price). I refuse to give the market my max $ risk amount, to me a stop is the best (only) insurance I have against another trading disaster.
Mental stops .... If I thought I could:
Get to my desk
Put down my latte'
Grab my mouse
Dump my trade
In 1/20th of a second, I might start using them
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