When peaking at your hole cards, turn them sideways one on top of the other. Then tilt the front right corner toward you at a 45-degree angle. From there you can lift that same corner and spread the cards slightly to view both card values at the same time and with minimum exposure to your opponents. This works best because the card values are printed on the top left and bottom right corners. If you look at your cards from any other angle, you'll wind up looking at the non-printed corners and have to lift your cards higher to see their values.