I Lost 70lbs a few years ago, I was 220 and cut down to 150 in about 4 months. You obviously dont want this drastic of a change, but here are some tips from someone whos been in your shoes and has successfully lost a substantial amount of weight:
Dont eat that many calories in one sitting. The easiest way to cut down diet wise, I found, was to break my meals up. I only eat 300-700 calories in one sitting for my primary meals, and I eat 100-200 calorie snacks inbetween. This is refered to as 'grazing'. example:
830am - cup of oatmeal with raisens and cinimon1030am - handful of walnuts and/or peanuts1230pm - turkey/chicken sandwich with spinach and tomato on it, apple, and an orange.3pm - a pear or another handful of walnuts (pear and apples are interchangable)6pm - some sort of lean protein like chicken/turkey/etc with some greens (i love those microwavable steamed veggie packs, they r GREAT!)
The idea behind 'grazing' is that your constantly burning calories, even when your sitting still, so why not constantly just feed your body the calories it needs throughout the day? instead of loading up 3 times a day, gradually just eat the necessary calories in 6-7 meals throughout the day. less storage, less potential weight gain. It also keeps your metabolism up because it is constantly having to work to digest and process food.
This in addition to working out in the mornings (I actually just started p90X ... and HOLY f*** is it insane lol) at 530am has all done me well.
You want to avoid being hungry or stuffed at any given time, those are bad feelings and you shouldnt really be in a hunger state for more than like 30mins.
one great site that has helped me design my own diet now was
http://www.active.com give it a shot sometime, check out the nutrition section, they have a forum and everything where you can ask questions and discuss things with similar minded peolpe as well as professionals.