Yes, I drink beer while working on my diesel. Especially if it is a job like what I'm doing now. I'm rebuilding the transmission, and I'm going pretty d*** slow doing it. I want to get it right the first time. Frequently, I'll step back, take a drink, ponder my situation, and find a simple solution to my next quandry. I've had to make a few tools so far, and I believe I've narrowed down what caused both trans to fail. (making one good out of 2 bad). I'm enjoying this project and the beer with it.
However, if I am doing something like moving the trans or anything heavier - anything hazardous in fact, I keep the beer in the fridge until I'm done.