To use this lipstick set, simply twist up the lipstick and apply it directly to your lips. Start from the center of your lips and work your way outwards. For a more defined look, you can use a lip liner first. As for the precautions, keep the lipsticks away from direct sunlight and high - temperature places to avoid melting. When it comes to maintenance, wipe the lipstick tip with a clean tissue after each use to keep it hygienic. Also, store the lipsticks in a cool and dry place.