The trick is to do it one hour at the time.
When craving, drink some water, find some distraction. The craving long far less than it seems.
After 48h without nicotine in your body. You have no more physiological dependency. The mental one endure for 2 month, and for some people that the most difficult. It's the demon in your brain having those automatic pathway of activity associated with nicotine. Change your routine, and tame the demon
obligatory Alen Carr book (pdf):