Make no mistake, nicotine is a very powerful substance and the first few days can be uncomfortable because your body is losing the nicotine. It is important to understand this, and be prepared for it, and perhaps pamper yourself a little to begin with. But always look for the positive angle with smoking cessation. See the slight discomfort of the first few days not as your body withdrawing, but as your body shedding the harmful toxins and poisons and starting to repair itself. Once those first two or three days are over you are dealing with a habit, albeit a strong one, but something that you can easily handle.
Find someone who has successfully become a non-smoker and ask them how the first few days were. They'll probably tell you they were fine. It is all part of the very positive process of becoming a non-smoker.
For further ideas and advice and ways to stop smoking, visit the substantial resources section of this site - Stop Smoking Resources