Welcome, Chris.
I'm afraid I have to agree with alchotag - I don't see how you'll be able to hide it from your husband for the time it will take for a real change. Contrary to the book, 4 months seems optimistic - anecdotally, a year seems like a more realistic timeframe to decide if it is going to work. I would urge you to get a copy of 'The Cure For Alcoholism' for both yourself and your husband. Then it'll be the book's reasoning and not your own that would come under fire - and the book's reasoning is solid

In terms of results, you will likely have that honeymoon period in the beginning, with significantly decreased drinking, followed by a return to 'normal' levels, followed by a long term, slow decrease in drinking (although some people seem to just stay at their near-regular level, then fall off a cliff at some point, in terms of consumption).
Have you seen changes right away? That seems to be a good indicator of success, although others have had eventual success without a honeymoon.
Regardless, I wish you the best of luck - I just started 3 weeks ago, so I hope we'll be able to track each other's progress towards control.