This isn't just subjected to trading as everything in this world is based on probability. There's no 100 percentage of the outcome coming out as you predicted even though you employed all the techniques, experience money can offer. Traders have to be mentality capable of accepting whatever outcome their trade produce and this isn't only address at losses since some traders out of over excitement of massive profit do some regrettably things like reinvesting into same trade hoping to replicate similar outcome.

Although probability is what trades are all about but still, experience and having the right tools and information plays a very important role in contributing to making the probability of a trade work in your favor, that's what makes you a professional trader.