After you are satisfied that the perfume`s fragrance, don`t hurry up to buy it. Try on a sample of that particular perfume and leave it on for a day. You will be able to know if the perfume suits your body, or any other possible allergies or headache, and even if the scent is losing or not from this simple exercise.
Now some dos and don`ts about perfume use.
Don`t keep an already opened perfume for long. Once opened it should be used else the fragrance will fade. Also direct exposure to sunlight or extreme temp can change the scent of your perfume, hence should always be kept in a cool, dry place away from direct light.