Here is my two cents: It's kind of like shooting pool for me. I have found there is a point between a couple and a "few" where I seem to be at a peak. But once I hit that one drink, I start sinking fast. I have been doing this for many many years. And I think that if I keep it at about three beers before starting, and one per set... I am ok. But again, if I'm not careful, I hit that point, and I suck. I find mostly in my feet. I hit a point where I just lose my ability to execute the notes.