It's psychologically difficult until you have confidence in your method. Once you establish a method that you know works, you can sit back, relax and enjoy the trade. No point having discipline until you have a method that you believe in. Discipline without a solid method is called a "grind".
Sadly it doesnt work like that either. You can never be sure your method will work in the future. All you can do is trade it, if it makes money it makes money, if it doesnt it doesnt. You just have to pull the trigger on every trade and hope for good market conditions. Hopefully you will make money but the markets can be brutal to your method for extended periods.
I appreciate what you're saying but I respectfully disagree with regards to the logic of this system. Its profitable regardless of market conditions.