Lessons learned from successful investors:
First: If you do not have even a small amount of anxiety over your investments, this means that you are not risking enough. You have to have enough money invested in order for you to have real interest. You will make the right decision when you participate in your investments with all your feelings, and then you will be able to monitor this investment and give it greater care.
Actually all is worth it to read and a lot of learnings here in the forum. This last part lesson from investors, as what others said never invest on what you cannot afford to lose. When I invest I usually study the marker first with great care of course, and just a start invest with a small amount of money so you can learn through with your experience in trading.