This is true, holding is not an easy thing for everyone who doesn't have any funds in trading. But for me, it is important to manage your money and try to put an amount of money that is just for trading purposes only and do not sell your coins specially when you are getting nervous because of the price drop.
Don't think to hold the purchase of a loss, try to hold the result of a purchase at a low price. It will make you happier. Of course it takes a way, and you have to practice it. In addition, holding must also have a realistic target, not just to make a profit. It all can be obtained from practicing and doing technical and fundamental analysis.