Congratulations, I hope you succeed in your effort. I managed to quit 13 years ago now. The main thing for me was (most likely different for everyone) that I had to break what I have dubbed the hand to mouth thing. Think about it for a minute, every day of your life, on a regular schedule you reach in your pocket and grab your smokes. Pop a cigarette in your mouth and light...then the hand goes to the mouth again and again and again till it's gone. Rinse and repeat this process 20-30-40 times a day, every day for 1 year, 5 years or 20...that's the hardest part to give up. Getting the nicotine out of your system is easy, but breaking the mental aspect (the hand to mouth thing) is a real [censored], but worth it once you get used to doing other things with your hands besides smoking.
I guess I still haven't broken that yet, because at school (and now at college) I was almost constantly seen with a pen or pencil in my mouth.