Breakfast is a problem. Not only is cereal high in carbs (incl. sugar), milk also has lactose in, which should be kept to a minimum, if you are serioulsy lo-carbing. A favourite breakfast of mine (when I have time to cook it) is eggs scrabled in butter with a little cream, along with some fried (again, in butter) Shitake Mushrooms.
Also - all fruits are not equal. Berries are good if you are lo-carbing, but Bananas should be avoided like the plague. great lo-carb snacks are things along the lines of Olives, cheese, meat, nuts, etc... You'll find these things fill youup much more, and so you'll eat less of them.
Potatoes are BAD. (Yes they are). sweet potatoes are a little better, but should still only be taken in moderation. Sweetcorn is a no-no, and carrots should not be eaten excessively either. Green Veg (spinach, string beans, cabbage, salad, etc...) are great. The more of these you can eat the better. Strict lo-carbers (like me) get all their carbs from this type of veg.
Good luck, and stick with it!