When I was starting to tell my AH that I thought he drank too much I noticed that he started to hide how much he was drinking, Then, with glorious hindsight, I realized that he had always hidden how much he was drinking.
When I would tell him this he would take it like a man, no excuses and no false promises. And no change, just more hiding.
I don't think I've seen him actually drink for years although he is a daily drinker. It used to include drinking in the morning, but that has stopped after he detoxed for a couple of weeks in a hospital.
If I would have know this I would never have married him. Please consider putting the brakes on your plans. It's a lot cheaper and easier to change your mind before than after.
Sending kind thoughts your way.