BS”D
I agree with VM as well, but will add another point:
No one (including the RBSO) expects you to be perfect, that is why He created Teshuva. You should view each day as a new and separate battle, and every day that you pass as a major victory. Those days where you lose, Hashem knows that you tried and you really don’t want to do it – Teshuva.
Your Father is in the stands, cheering you on. Don’t get discouraged from a single loss after so many wins. And you get rewarded for effort, even when you lose.
Hatzlacha.
On a practical note, create a geder for yourself. That way even if you go over the fence you still have a chance to stop yourself before any real action.