controlling the emotion is the hardest thing that we can do because if we are see the price is increase, sometimes we want more from the price and hope that the price can increase again but finally the price is going to go down so we are not selling anything. i have this experience too with my trading but i think we can prevent this with using the limit price in one level price so we don't have to watching the coins is up and down and if our price level is filled, our coins is already sold. this can avoid us from greedy because expecting big profit and i think we can expecting how much profit we want and then lets the market give it to us.