You said it all in being extra discipline.
One thing I learn in mathematics is to follow the rule and stay focus on the rules. It takes a lot of discipline to excel in mathematics. Now apply the lesson to real life goals or projects and you get thesame result.
To achieve anything in life sacrifice must be made and discipline is a part of it
RE: 7 things to do to become more successful (No 6 & 7 will shock you)