This is so simple, anyone can do it.
Section hair, straighten and start with a small section in the middle, cutting below your fingers. Using the hair you cut as a guide when cutting the other sections.
Continue to cut the right section, starting at the center.
If you stop now you will have textured blunt bangs, or use sheers to soften the ends.
For Vertical Bangs:
Section hair vertically, section the hair, cutting the top front ends, leaving the layer underneath at length – a technique known as layering.