Scully is very right. Just cutting out a few hundred calories from your diet and exercising will help you lose weight.
It's better to make a goal that takes you longer that try to cut back calories so much to meet a certain date. This will discourage you. You don't necessarily need to keep up a detail log book, although it helps at the beginning to get a feeling on how much you are consuming. Once you got an idea of how much calories are in various types of food you can just do a mental picture.
Do what Scully said in her post and you will see results. Guaranteed or your money back!