I did this once and it can be done neatly. But it will take all damn day and a drill will work better.
Take a paper clip and straighten part of it out. Applying steady pressure, push the point of your paper clip where you want the center of your hole to be. Rotate it left and right like a screwdriver/awl. This will drill a tiny hole into the soft plastic.
Once you can fit the paperclip point through, take a phillips screwdriver with a reasonably fine point and do the same thing. Once that fits through, take an even bigger scrwdriver and do the same thing again.
Eventually you will have a hole big enough to fit a file through. I would suggest a round file but if you can’t find one or are ghetto then use a nail file, since se cases have soft plastic.
Use the file to enlarge the hole on all sides. It’s unlikely you will be able to make a perfect circle, so file a little bit at a time and constantly try to fit the button through. Try to file the bare minimum it takes to get the button through, because if you file too much it will look ugly or the hole will be too big.
Best of luck but this method takes forever. Find a movie to watch while doing it or just buy a cheap drill.
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