Addict,
I think it's as simple as being confident in your setups and then consistently executing your trading plan.
It's very easy to say, but hard to achieve. To first get to the level where you can trade your setups w/o hesitation is not easy to do. Until you prove to yourself that your setups work, you'll always being wondering if you should just tweak it a little...
And then to build a trade management plan and executing it the same exact way each time is part 2. As I mentioned in my
blackjack strategy thread, I believe you must execute your plan the same way each and every time.