some good advice I got before, don't tell yourself you are quitting, tell yourself you are stopping. Psychologically it is easier, because if you stop, you can re-start, but if you say you are quitting and start back up, you have failed, which makes it tougher stop again further down the road.
In my opinion, Cold Turkey is the way to go, and good luck, but the closest I came to quitting was by using these filter things. They were in 4 stages, and you got less and less nicotine and tar. I felt like an ass using them, but so be it, and my cravings almost went away (but then I had one without the filters and I was right back in it).
Good luck man, just remember the first 2 weeks are the hardest, get through that and you'll be ok. And for those tough cravings, try taking a bic pen (take the ink out of course) and cut it about the size of a smoke. When the urge hits you, just breath through the pen like it was a smoke, the rhythmic breathing should help calm your nerves and ease the craving.