If you're a snacker throughout the day, the best thing you can do for yourself is to have a power snack prepared. Mix three different kinds of beans and sprinkle in some low-cal Italian dressing for a delicious snack all week long.
Also, whenever you eat, be mindful. Eat without doing anything else- no TV, no reading, no working. Try chewing a strong-flavored gum like cinnamon while you're cooking to make sneaking a taste less appealing.
Another small trick to stay mindful of snacking? Tighten your belt. When you feel a craving and temptation to gorge, tighten your belt a notch as a reminder of the size you'd like to be.