Here's a follow up video to my last haircutting video: How to do a basic haircut. This basic idea can be used to cut any type of bangs, not just side swept. If you want straight bangs, just don't angle your scissors, and cut straight across. Remember, you can always cut more later--so start out cutting the bangs a touch longer than you think you'd like them (because of course you will be cutting WET hair, right?). After you dry them, and still want them shorter, then redo--but no one wants to walk around with too short bangs--right!?
How to cut side swept bangs: