My intention is to turn this into an article, as I couldn't find one on the topic. Before that, I'd like feedback, do you understand this? Should I include something more?
This method is based on several methods that people have mentioned here on LHC or linked to, thanks to them for the ideas. It is suitable for longer hairs, waist+ length I'd guess.
You'll need a good scissors, comb, a hair elastic and a mirror (preferably two to be able to check out your hair in the back).
Start by detangling your hair properly. Then bend forward and comb your hair over your head towards your face. Gather your hair to a ponytail just at your hairline, right above your forehead. Then stand up straight, grab that ponytail with one hand and the elastic with another. Carefully slide the elastic toward the end of the tail, while you keep the ponytail straight out and away from your face. Don't slide the elastic all the way down, stop a good bit before your reach the ends. Grab your scissors and cut the ends straight off. I'd recommend to cut about 4-6"/10-15cm, no more, this will probably not (hopefully not) affect your length but create some nice long layers. If you want a heavier layering, you can cut one more time.
When you've done the cut, take out the ponytail and assess the result. In my case I decided to continue with the shaping, I used the first step of Feye's self trim method to create an U-shape. I felt this was needed to make the layers look more finished and it made the layers blend in better. In this step you really don't have to cut much, just take off 1-2"/3-5cm to soften the "edges".
This is how my hair looked some weeks after the trim:
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