Fit the wig onto the foam wig head, secure it with pins and comb the hair until it's smooth. If you have a lace-front wig, find the center front of your wig -- where a center part would begin -- and pick a point at least one inch behind the front of the lace. It is from this point that you'll gather hair for your bangs. For a monofilament top wig, you can go back slightly less than an inch for wispier, thinner bangs. If you don't have a wig head, you can wear the wig while cutting.

Comb forward the hair that you want to cut into bangs. Clip the rest of the hair back to keep it out of your way. The section of hair for your bangs should start above the center of your left eye and go horizontally across, ending at the point above the center of your right eye. For a wider bang, you can cut more hair from the sides, but begin with less to avoid overcutting.

Comb the section of hair straight and hold it between your thumb and forefinger in front of the nose. Trim the hair off at the tip of the nose. The length of the bangs will be very long. Also, since you pulled all the hair to a center point, the bangs will be slightly longer on the sides. This will help your bangs blend more seamlessly into the rest of your wig hair.

Slowly and carefully trim your bangs up to your desired length, taking off just 1/8 to 1/4 inch with every snip. If you're using a wig head, remove the wig and place it on the wearer to ensure that you cut the bangs to a flattering length. Longer bangs help disguise a large forehead and tend to be more universally flattering, while a bang cut slightly above the eyebrows will showcase the wearer's eyes.

Comb an extra 1/2 inch of hair back from the top front of the wig if you want to cut a thicker bang. Comb in and cut an extra 1/4 inch of hair on either side of the forehead (above each eye) to create a wider bang.