Congratulations, J!! I wouldn't say "good luck", because I know you will make it through!!
Yes, that is one of the most important keys to success, never let your confidence buckle, and keep believing in yourself.
Then, take it one day at a time, sounds like a cheesy clichè, but it is so true, if you are concerned about remaining smoke free just for today, it is not such a drama, but it becomes an awful drama when you start thinking about "how the heck I am going to deal with the rest of my entire life without smoking?".
Trust also in time... right now it may seem impossible, but it WILL get easier as the time go by. Fill your time with all the things you enjoy doing, keep your mind and hand busy.
Keep us posted how you are doing, we are all cheering for ya!!