I did try that once, well, to see how much I could drink alcohol-wise before I was a worthless lump when placing parts, on even a small run it's a boring task doing this by hand, at least you should be able to enjoy yourself, right? One glass of wine didn't make any noticeable difference. Two, and I might as well sit on the sofa and watch the TV instead, the difference in dexterity and concentration was startling. It was an experiment not worth repeating.