Everything in moderation, nothing in excess.
The other day after I shot some better groups with my rifle I cleaned it, loaded it (a condition I keep all my firearms in) and put it away before I had ONE beer.
I touch type. When I am drinking a beer while sitting here writing something, I invariably make lots of spelling mistakes. I usually do that anyway, but I catch 'em right away and hit the backspace key. With the beer, that doesn't happen. I can see how this could translate into accidently putting your finger on the trigger...
When I drink, I stop at two beers, max. I do not go off my property armed even if I've only had one, and remember, I live in a state which doesn't really regulate how much you can drink while armed. Search Indiana code; you'll come up with zilch.
Best practice is to know your limit and stop well before it.