Highlighting dark hair can give your hair an overall brighter hue and add contrast and dimension to dull, lifeless-looking locks. But at-home highlighting can be tricky; if you're not used to dyeing hair, you may want to leave the process to a professional. If you do have some experience and some confidence, go ahead and try it. Just make sure you read the instructions completely before attempting to add highlights.
Start with clean, dry hair and part your hair as you normally would. You’ll want to use the product on dry hair, since wet hair can dilute the product you are using.
Mix your at-home highlighting kit. The lightening product will be mixed with an activator of some sort.
Apply your highlights working from front to back; be sure you apply the color from root to tip in one swoop on small strands of hair. Also, make sure that you space your highlights out evenly from one side of your part to the other. If you are touching up old highlights, only highlight the regrowth instead of painting the whole strand, which can cause unnecessary damage.
Allow hair to process according to the directions on the package, anywhere from 20 to 45 minutes, then rinse, shampoo and condition your hair.