If you don’t have a stencil, use a makeup brush handle or rattail comb (any long, slim, straight object works) to determine where your brows should begin and end. First, hold the handle up to the high point of your nostril, then follow it up to your brow. That’s the spot where your brow should begin. In the past, experts referenced the side of the nose as the marker, but that results in brows that are set too far apart. To locate your arch, hold the handle at the side of your nose, angling it so that it cuts through your pupil. To find where your brow should end, move the handle to the side of your nose, angling it so it reaches the outer corner of your eye.