I recieved my order from pbs animal health today, blood tubes and those special 'butterfly' needles. I've got a couple questions : 1. How do you use these 'butterfly' needles and vacuum tubes? If I were to stick the needle into the tube, wouldn't the tube immediately loose it's vacuum (and therefore it's purpose)? Do I stick the needle in the goat first, then stick the other end through the rubberstopper? I'm confused. 2. How do you all draw blood? I've seen a couple good picture instructions on how to do so, but don't know where to find it again. Anyone know of some good links?