I did have a good knowledge and the only absence was making a big plan. I returned to drinking and it was just as before.
I then made a decision, re-affirmed my intent to myself and began my abstinence.
I know it's tired and used much here, but what are your future plans for the use of alcohol?
If you answer that truthfully to yourself, everything else kind of falls into place.
The doubts you have about effectiveness of the technique due to your mistake are pure AV. Ignore it if you are ready. The beast loves to plant seeds of doubt.