No matter what is going on, no matter what mistakes you made today or yesterday--just stick with it. You are making changes in the way that you live and little by little, piece by piece, you will get this big job done and you will be so glad that you did this.
I sometimes forget that this is a life journey and a lifestyle change adn I beat myself up for some little thing. Let up on yourself--you are here and you are working at it. Keep at it and you will get there and it will be just right for you.