Using styling scissors instead of clippers will help you make more precise cuts and give your hair more texture. You can buy styling scissors online or at most hair care stores. Do not use household scissors to cut your hair, as they aren't sharp enough to properly cut hair so you're more likely to make mistakes. Use your fingers or a comb to raise the hair from the top of your head. Work slowly and carefully in 1/4 in (about 6 mm) sections. These should be parallel to the front of your hairline. As you trim, pull a little of the previously cut section into the new section as a traveling guideline.  Cuts to the hair on top of your head are more noticeable than cuts to the hair on the sides of your head. Always start with conservative cuts. Remember, you can always cut more, but you can't add back lost length. When you've finished with this area, you can check your guideline by holding up a section of hair that is perpendicular to your hairline. Your hair should be the same length across the entirety of this section. Be gentle on your head while cutting the crown, which is usually more tender than the rest of the head. if applicable, with styling scissors. If you have bangs, section it into small parts. Brush your comb through each section the amount you want to cut pokes through the end and trim it off with your scissors.

Summary:
Use styling scissors on the top of your head. Trim the top in sections. Trim your bangs,