You need to always manage your risk properly. If you do not control your risk on EVERY single trade, you open the door for emotional trading to take hold of your mind, and I can promise you that once you start down the slippery slope of emotional Forex trading, it CAN be very hard to stop your slide, or even recognize that you are trading emotionally in the first place. You can largely eliminate the possibility of becoming an overly-emotional trader by only risking an amount of money per trade that you are 100% OK with losing. You should EXPECT TO LOSE on any given trade, that way you are always aware of the very real possibility of it actually happening.
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One pound on Monday can bring you 1.19 euros. On Tuesday 1.20 euros. This tiny change may not seem like a big deal. But think about it on a larger scale. A large international company may have to pay foreign employees. Imagine what this can do for a practical purpose, if, as in the example above, a simple exchange of one currency for another costs you more, depending on when you do it? These few kopecks add up quickly. In both cases, you, as a traveler or business owner, can keep your money until the forex course becomes more favorable.

The problem is that this is where traders are most likely to succumb to overconfidence bias. It's not uncommon for traders to complete a winning streak and then believe that they can't get anything wrong in the future. To believe this is of course unwise, and is only going to end in failure. Make sure you always analyse your trading sessions and look at your wins and losses in detail.