There is something about understanding the emotions of the market; and also learning how to identify a market trend.
Before you can prevent trading against a trend, you must learn what a trend is.

I will summarize a trend to be the emotions of the traders on a particular trading pair chart; you need to be able to understand a stable and panic trends on the market; to guide your entry and exits points in a trade.

Also, you need to have it in mind that losing a trade is not a big deal, but getting more   profit is the goal and most important.