snip..
many have experienced problems like yours and to be honest, in the past, I was one of that (always lose because of selling and buying at the wrong price). this all happened because of my inability to control emotions.. my advice is to learn to control your emotions by trading small amounts every day, if you are able to control your emotions a little then you can increase the number of your transactions and so on.
I just thinking that the new trader will trade depend on his strategy learning. They will learn first how strategy that they use such as moving avarage, RSI and etc but I'm sure they will forget to learn how they should be do by their emotional when they are trade.
But as far as I know, we need more prectice to control our emotion when we trade. You might ever felt when you became new trader you will feel restless when the price is going down and you will be calm when the price movement is going up and you just confuse how to deal with that situation. But when you have many experience you will face any situation calmly and believe that your prediction will give you profit.