Whenever I do something experimental with my hair, there is always that moment after the first cut when it hits me that there's no going back now. If I did it wrong I'll just have to try and even it out later. Your MC probably isn't thinking in detail about how amateurish her hack-job is. But if you really do want to show that what she's doing to her hair is a big departure from her usual behavior, you could have a moment where she sees the first cut in the mirror, and gets all meta. She's really doing this. What else from her old life will she have to toss aside before she's through? That sort of thing.
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