So, this is my first vest, which I essentially pulled out of thin air, with some help learning the concept for armholes and neckholes from this pattern. At first, I cast on about 200 stitches onto my thick circular needles, found out that it was far too many, and redid everything with 108 stitches.
Shaping the armholes and neckhole turned out to be far easier than I imagined. I couldn’t follow that pattern exactly since my needles and number of stitches differed from theirs. I was afraid that the holes would thus be horribly misshapen, but it turned out well when I added the ribbing. Overall, a good final result and a nice learning experience.