The rules are simple, but its not that easy to follow or execute as emotions get us in between. Thats why most people after giving a try in trading, quit. If you want to be profitable in trading you should follow your system properly. Before that you should back test your system atleast for 2 to 4 years to know the maximum draw down. This gives you the confidence to follow your system.
After entering a trade, if you want to break the rules, remember this, "The decisions we make in the middle of the trading have 50/50 probability of becoming right or wrong which will make us regret after the trade is over. But the back tested system is always right". Develop a system, back test it and follow it to be more profitable!!!