Weight loss goal

I've discovered that every time I try to set a weight loss goal for myself, I always fall short of achieving it. However, I am going to give it another shot; actually, 2 shots, technically. I've decide to try and lose 20-25 lbs by September 1st (2011). And next year, I will try to lose 20 lbs by August 1st (2012). If I meet my goals over the next year and a half, then I will have lost at least 40 lbs before my wedding, which would put me at a decent weight.

So far, all I'm really doing to achieve my goal is cutting out fast food (for Lent, but I might try and continue it after Lent is over) and trying to take 1-hour walks at least 4 days a week. When it FINALLY starts warming up and turning into Spring, the walking goal should be a lot easier to meet and I might even be able to increase it to either have longer walks (like 1.5-2 hours) or increase the amount of walks per week (I think 5-6 days would be my max because I know that I won't make it out 7 days a week every week).

I really hope that I can stick with this plan because it's really important for me to lose this weight before the wedding so that I can fit into my dress and feel comfortable in it. But, even if I only drop 20 lbs, that's still going to be better than where I'm at now.