One of the difficult things with trading is that you can follow a trading plan to the T for years and do very well through that discipline and self-control, but it only takes ONE trade where you’re over-leveraged and the market goes against you to wipe out a huge portion of all the money you’ve made. Your position size on a trade is determined by the stop loss because you must adjust your position size to maintain your desired dollar risk per trade so that you don’t exceed it, and the size of the position will vary depending on how wide your stop is. The lessons I have learned from the trading greats have heavily influenced my personal trading approach and the strategies and lessons I teach in my professional trading courses.