No matter what plan or support ends up working for you, it's going to involve having a Day One, a day that's different than the day before because on this Day One you're not going to drink.
That can be really hard for some people (it was always very hard for me), and not so hard for some others, but pencil that in as Step Number One. Whether you plan it out in advance or it's an impulse buy, that is the step-off-the-cliff moment, the beginning of the end, whatever..
After you get that Day One in the books, after that you're just not starting again. There are a lot of things you can do to help stay on course (AA / therapy / mind tricks / staying busy / go live on a desert island / whatever works), therein lies the complexity and nuance, but it can all be simplified (for purposes of discussion) to "don't start again."
(yeah yeah yeah yeah there's a lot more to it, you have to basically relearn how to live a "normal" life, figure out how to fill your newly-acquired free time, undergo a voyage of personal discovery as you're pretty much a new dude .. but let's not get the head spinning with all that right now; it'll present itself as it comes)
So, yeah - basic blueprint is have a day where you don't drink, then follow that with a day you still don't drink, then follow that with a da -- you see where this is going.