I smoked up to two packs a day for nearly thirty years. I quit maybe a dozen times and each attempt was well planned including setting a date, cutting down by a schedule, use of help, etc. None worked until I just got fed up and disgusted with myself. I just thrown the half mocked pack into the trash one day, say I quit, and didn't give in to the temptations which didn't really end for good five years or more later.

My advice is convince yourself it's the best thing you can do for YOU, and you are taking control of yourself and that habit you don't like or want anymore. Just do it and good luck.