Actually emotions are something that is very difficult to control for myself, whenever I invest in a project or when I sell, I always have the question: "What if I sell them? How about holding it ... "is really very vague in the decision and you are right that greed it always motivates us, makes us lose everything, but fear is also a factor importantly, for new traders they often suffer from "panic buying and selling panic" situations which lead to losses. It is better to trade according to the plan that you have set, set goals and follow the roadmap, do not let emotions dominate you.