I think it is quite obvious that you need to make sure that all goes smoothly when trading and anything that is out of expected could be a trouble, because you make a trade based on what it looks like it will happen, and anything that deviates from that would mean that the result would not be what you are expecting. Obviously there are tons of people who will do what they think is right when it's in fact is wrong, so giving up on something is not a trouble and if you think that's a bad trade then you should stop, or a bad strategy as well.
But, when you are doing even the most right thing you should do based on every strategy out there, something could change along the way and you should be ready to cut the rope quickly before it goes even further south than you anticipated.
Always follow best strategy with indicator for trading. We often guess and trade after looking at indicators and support and resistance levels. Sometimes, when everything is going well, the market can fall due to bad news. Sometimes our guesses are wrong.
Indicators also cannot trade you with complete accuracy. So you are right that the market does not always go according to our expectations. What matters most to us is the accuracy rate of our trading. No trader can exit all trades with 100% accuracy. In my opinion if seven out of ten trades come out right, this is the best rate for profit. The crypto currency market is a volatile market where the market can go in any direction at any moment. We just have to guess based on our experience and knowledge.