Recently in Colette Pattern's Snippets Department, there was a whole lotta nonlove for the stuff that trips you up in sewing. From the things that are just hard to remember (which was to turn for french seams) to the the hard to avoid (staring at the moving needle when topstitching), there's always something that messes a body up.
I have several (shirt/pants open wrong way, kaff kaff) but one I have learned to work around is
The Failed Buttonhole.
The Bernina, the Damned One, can make an automatic buttonhole. It's never the same size from hole to hole in the same piece, so I just don't use it anymore.
I draw a box on the fabric, or sewing lines, and I do four turns with the zig zag set reasonably dense. Not super dense, but something that gived adequate coverage. And I do four turns, and sink the needle at the corners.
The zig zag will not entirely match up. Perfect is the enemy of good. I should point out that this will look better than if I use the automatic button hole feature.
I poke a hole in the opening with my seam ripper, and use cuticle scissors to trim to the ends. Then I grab the thing, pull the sides to open it up, and clean up the whiskers that linger.
If I can't draw on the fabric because there is too much texture, I will make a bound buttonhole, using iron on woven facing pulled through to the back. But that's another day.