Section off the hair you want to cut and clip the rest back.
Split your bangs in half using a comb. Hold one half and comb the
hair down, with the comb's teeth facing out. Cut slowly below the
comb, doing a little bit at a time, as if you were nipping away at
the hair. Cut your bangs to your brow bone. Never try to cut them
straight across; it's impossible to keep a straight line. Instead,
snip at a slightly upward angle. After cutting the other half, comb
your bangs down to make sure they are even.
Tip: Cut your hair only when it's dry. Your hair shrinks as
it dries, so if you cut it when it's wet, it will end up shorter
than you intended.