I developed a profitable strategy several months before I built personal discipline to trade it. Perhaps that's par for the course. Whatever the case, took me a while before I had faith in what I was doing.
Along the way I started to keep tabs on 2 things.
-Days without incident
-Trades without incident
I defined an incident as doing anything outside of my plan. The biggest offenses (for me) were skipping valid signals, or taking non-valids. Both impulsive decisions.
The goal became to see how many trades and/or how many days I could execute my plan without deviation, results be damned.
As the numbers grew for both days (e.g. 3, 10, 50...) and trades (e.g 25, 100, 200...), execution grew easier and easier. Of course I had relapses along the way, and I'd have to start back at 0. But eventually a day came that I was looking back at a significant amount of days/trades where I perfectly executed my strategy, and by then I had lost the inclination to do anything else.