Though many people shape their eyebrows by waxing or threading, the drawback is the wait between visits to the salon. It's for this reason that most women tweeze their brows themselves. If you haven't shaped your brows before, it's a good idea to have a technician start you on the right path. A professional can wax your brow to give it a good shape, then you can maintain that shape by tweezing on your own. If this doesn't appeal to you, electrolysis is a great way to eliminate the need to tweeze your brows (though this requires extra time and money).
Shaping your eyebrows correctly is important because it can change your facial expression. Though the shape is up to you, it's best to stay as natural as possible. In general, the beginning of the brow should be aligned with the center of the nostril below it and should extend a bit past the outer corner of the eye. The arch should fall over the outer third of the eye. Tweezing too far in from the inner edge of the eyebrow will make your eyes look smaller; plucking too much from the bottom will make you look perpetually surprised. If you have doubts, leave the hair unplucked. Be sure to tweeze in the direction that the hair grows and pluck only one hair at a time. Proceed with caution! Eyebrow hair grows back slowly.
Threading is an ancient form of hair removal from India and the Middle East that's being rediscovered today. The threader loops a cotton thread around the hair to be removed, twists it, then pulls the hair from the follicle. The procedure is commonly used on facial hair. The amount of pain experienced is similar to that of tweezing.