Good luck on you day 1, and 2 and 3 and so on...
As for myself, there were countless number of times that I announced (to myself, others or both) I was no longer drinking, and I did stop for a bit, only to start again, for one reason or another. Maybe because after drinking for so long, my body and/or brain was not at all comfortable with removing the alcohol! In any case, what worked for me was to be hanging out with lots of people who had managed to break the habit- i.e. attending AA meetings & talking to people there I liked/respected.
You should also be talking to your doctor, probably there is nothing to worry about, but stopping drinking can be deadly. I didn't talk to a doctor when I stopped, but since I have heard stories, and read statistics. At least in retrospect, I don't think I should have taken this risk...