Trade exits are common occurrences in Forex trading. People check the volatile of the times and then see how that is reflecting their current finances. Whether they will survive the onslaught or not is a question. Often one knows that there would an upside but cannot hold stocks till then, resulting in a loss. It is better to pre-empt that and exit the trade losing much less.
People take recourse on the Moving Average Convergence Divergence and see whether a particular stock is failing the trigger. This is done over a 12 or 26 day period. Then there are 1 minute charts laid over 18 to get Relative Strength Index of that pat same share. If the number fails to waver between 25 and 75, it is wise to leave the trade beforehand.
It is obviously advised to take advises from analysts and trading authorities. They know where the trend will be bucked and are in a position to counsel you.