Tools pictured: styling clamp (internet); foam head (costume shop); styling clips (beauty supply shop/walmart); strong, cheap hairspray (grocery store); hairdryer; wig detangler, specialty brush (beauty supply shop); trimming scissors (walmart); wide-tooth comb (drugstore)
2 - Hair dryer helps to make minor adjustments to the direction of the bangs fiber.
Clip fiber in place and apply heat to the roots, keeping dryer a few inches from the fiber. Tug gently on the ends to encourage the proper direction. Allow to cool.
3 - Reduce to approximate desired length.
Using small, inward clipping motions, cut bangs fiber slightly longer than desired. The wig head will be smaller than that of a real person, so allow extra length to accommodate this.