Be transparent regarding what you are trying to accomplish through your resolution. Perhaps you are at an age in which your health becomes more significant than instant gratification. You might resolve to eliminate junk foods and fried foods from your diet.
When you look at the root cause of what you are trying to change, you will figure out what approach will work best in order to remove the harmful habit and begin a new, positive one. Be committed to the end game, and to achieve a goal, you need to be able to envision it in your mind. From that point forward, you should never waver and stick to your guns, no matter how difficult it is.