Don't be too hard on yourself! We all have setbacks and days we don't feel like exercising. As for setbacks you can't let them put you on a guilt trip especially if you're an emotional eater. Admit your setback, forgive yourself and determine to do better. It takes time to make this life change. When I first started I tried to walk for 10 minutes several times a day. As I lost weight I started feeling more like walking longer periods of time. Now I do anywhere from 45-60 minutes of power walking, or stationary bike (almost a year later). Another suggestion is don't let the scales dictate your mood. I know that I can fluctuate in weight from day to day. I have clothes a size too small that I try on as one of my measuring systems of my success. The other is how I feel and the goals I get to mark off. (I set goals and hang them on my bathroom mirror as I reach them I mark them off), every small goal adds up to your final goal and help in your developing a life change. You can do this but it will take some effort and time on your part.