To me the single most important step in gaining lasting sobriety is to really, really take ownership of the problem. This is the essence of the first of the 12 Steps of AA or the Big Plan of Rational Recovery. Nobody else can own it for you.
Accepting ownership means acknowledging deep in your heart and soul that: 1.) Alcohol is the root of your problem, 2.) That you can only solve the problem by stopping drinking, 3.) That there are no magic bullets or pills that will make the problem go away, 4.) That nobody else can quit drinking for you, and 5.) You have to stop drinking all by yourself; it’s a lonely, difficult journey.
Sobriety comes from within.
Sure, support helps, it helps a lot, but support can only help you hold to your own commitment: A support group cannot create commitment for you. But, they can provide an environment in which you create it for yourself.