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Candeka said, it's probably best to not dive right in and instead form the habits slowly over a period of time. Your way isn't "wrong" of course, but you might burn out if you change everything at once! I know I would have!
You don't need to exercise so much (and if you are, I hope you're not doing this level every day) because the majority of your weight loss will come from what you eat. Make sure to get some strength training in so you avoid excessive muscle loss.
Remember too that your body needs time to rest between workouts! Muscles are not built at the gym—they're built the days between your workouts!
I can't really give you any tips for avoiding snacking. I snack a lot. It's the only way I can get enough calories in because I can't eat too much in one sitting! If you find that you're very hungry between meals you might consider eating lower calorie, filling meals and supplementing them with planned snacks.