I think Coach Dean says it best from his own experience. "I’m not going to sugarcoat things here, or tell you that starting and sticking to an effective exercise plan will be easy or fun. The fact is that if you’re very overweight and out of shape, you’re likely going to face some obstacles—both physically and mentally—that will challenge you in every possible way.
But I can tell you this: These obstacles are not just obstacles to exercise—they are the same challenges that stand between you and the life you want for yourself. If you can find a way to meet these challenges head-on now, by being successful at making exercise a part of your daily life, you’ll have self-management skills and the confidence you need to handle just about anything else life might throw at you. Exercise can help you shed pounds, and a lot of other unwanted baggage as well."
Here is the first of a three article series that might also be helpful as you get started.
Think You're Too Heavy to Exercise? - Part 1
Getting Off To a Good Start www.sparkpeople.com/resource/fitness_artic