Even though many salons don’t charge for touching up bangs, it can be annoying having to actually go there. To do it yourself, you’ll first need a pair of sharp hair cutting shears such as Tweezerman's Spirt 2000 Styling Shears. Taking dry hair (cutting bangs wet runs the risk of cutting them too short) divide your bangs into 3 sections (left, middle and right). Take one section at a time and twist it in front of your face. Start with about an eighth of an inch. Remember you can always cut more, so don’t be overzealous. If your bangs are still too long, re-twist the hair and cut as needed. If all else fails and you made that one fatally horrific cut, simply go to a salon. Most of the time you won’t need an appointment and the situation is usually salvageable.