Walking is a great way to take off extra weight. Walking gets your metabolism up and going, helps to lower blood pressure and speed up digestion. You can burn up to 500 calories each hour and that is about the same as the calories of a small meal.
Don't be an "extremist" with your weight loss journey. If your body is used to 3000 calories a day, and taking food in whenever you feel a pang of hunger, well it's not going to like you limiting the calories to 1200 calories and "starving" through those pangs. Set a goal of 1500 calories and spread them out throughout the day. Eat an apple or even a small salad for a snack. Chew on some celery or carrot sticks You would be surprised at what you now like.