Commit to the color. Keep in mind that you'll be coloring your hair all over, so you should plan to commit to darker hair for a while, according to Lee. "You
don't want to flip-flop back and forth from light to dark and vice versa, as this can cause damage to your hair."
Consult a stylist. "It may seem easy to grab a box dye from the beauty aisle in a drugstore. However, you're probably not going to achieve the exact color you are going for," says Fitzsimons. "Always consult with your stylist or colorist about your desired color so they can customize the right products for your hair type."
Patch-test the hair dye. Fitzsimons warns that dyes can be harsh on skin, so you should do a small patch test to ensure you don't have an allergic reaction before covering your head in dye.