you need to set the your targets. dont go with the flow, dont follow the crowd. just make ur profit target and right after the exist dont even bother to look at that coin again
this is it , to sell on the news you need to be on top of the news. which requires a lot of time. for most people it is the easiest way to set a target and sell on that target , don't think you can go higher and gamble it all away.
Margin trading, yes this is suitable in many cases. But actually difference comes when different people have different ways of thinking, results and goals etc. so we cant say that only this one is the best of all methods. Rather the methods differ from one another depending upon who is trading right now. As far as margin trading is concerned, definitely it will save you from big losses sometimes.