Choosing and applying a fragrance is kind of like walking a tightrope: it takes perfect balance. Spray too little and your scent is completely missed. Spray too much and you'll give everyone within 10 feet of you a migraine. What complicates things more is how important scents are in our everyday life. "Fragrance can be extremely powerful," says Nicky Kinnaird, the founder of Space NK. "It can instantly evoke memories and is representative of who you are." And the last thing you want to represent is a girl who can't hold her perfume. So how do you keep your fragrance behavior in check? We sniff out the answers when you keep reading.