Thats why a trader needs to keep learning and always learn and practise as much as you can, thats what will eradicate the fears and pressure. as soon as you make your analysis and place your trade then you dont have a power over the market to make it go your way. all you can do is to cut your losses if you are concerned. thats why you need to test your strategy over and over, this builds confidence and helps you know how to adjust it.