When I started running in January, two months after giving birth to my third child, I took a picture of myself. I was so disgusted with what I saw in the picture, it was just the motivation I was looking for. I think I ran four blocks instead of two that night and let me tell you, it was a rough run.
Now I sit here, 6 months later and a week before my first half marathon. I have lost 54 lbs and my BMI is out of the obesity range. I am healthier and happier than I have ever been. I still have about twenty-five pounds to lose, but I wont say I am not proud of myself.
My advice to you, if you have a lot of weight to lose and no idea how to start, is to make a goal other than a certain amount of pounds lost. Whether it be a race, a certain amount of miles, or an overall healthier diet, try to take the focus off of the ever-so-daunting number on the scale. It's working for me!