Well, this is not a very pretty tip, but it certainly is useful. I learned that if you have a pimple that is ready to pop out (ugh, disgusting, I know), use two cotton swabs (or one and break it in half) and squeeze the thing with both cotton swabs, instead of using your nails and fingers. It's more sanitary and you have A LOT less chance to get it infected.
(P.S. If you do this, make sure that the pimple is really ready to go, don't do it if you just have a half-there pimple or you'll make it worse)