1) Have something at the ready and plenty in stock to replace the craving for smokes. Celery sticks, carrots, snacks, whatever it is.
2) Depending on how heavy of a smoker you are, get into an activity to curb the immense rage that may come after a few days. Preferably something physically active. Whatever it is, don't sleep/nap it off.
The top two points are meant to keep your mind off the subject. The less you think about it, the easier it is to deal with it. Don't be around people/at places that are smoker friendly. Stay away from people that try to sabotage your attempt(might want to consider that a "forever" deal) and keep support close by.
I'm driving the point that you need to find ways to keep ciggs away from you (the thought of it and the thing itself). Don't think you can just do this with sheer willpower alone, imo that's quite a rare feat. There's a reason the industry is a multi trillion
venture. Most smokers know that smoking is bad for them, but you know, nicotine.
3) Have some form of checklist to track your daily progress. A simple tick on a calender for each day you didn't touch a cigg can be some kind of "reward". Make a big deal out of that.
If it's too crappy of a reward to you, think of something that suits.
4) Make it count and be serious about it like how andywestken has described. Just bear in mind that each time you fail, it's just gonna get harder the next time.
5) Don't regress when you succeed. Quitting means quitting. Not stopping for a month, or even a year, it means forever
Pretty much a down-to-earth look at what it's like to quit smoking.