The default "risk adverse" human instinct is to take profits immediately as soon as they see small gains, and to let the losers run indefinitely
in the hopes that at some point the position might reverse...

When you are just starting out in trading, you should focus training your discipline to adapt to counter intuitive techniques that are often necessitated by profitable trading systems, and become aware that in many cases you will need to go against "common sense" and mainstream human inclinations to gain an edge over the competition in order to become a profitable trader...