My hair is long, to the middle of my back. To cut my own hair, I take my curling iron (cold and not turned on) then grab a section as though I was going to curl it. I slide the curling iron down almost to the end. Then I hold the iron out in front of me and trim off the 1/2 inch of uneven ends. I go around all of my hair this way, just pinning out of the way what's already been cut. I never need help and I save a fortune!
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If you are cutting your own hair and want to get "interest" around the edges, just twirl the side strands together, then cut diagonally along the bottom.
To cut your own hair so that it frames your face in layers, do the following: Standing in front of a mirror, front comb hair and fasten in a ponytail directly above your nose. Make sure that hair is evenly drawn into covered elastic band.
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Even if you are too chicken to try to cut your own hair, you might start by TRIMMING it.