To make a buttonhole on the Kenmore, you place your chosen button into the slot on the back of the buttonhole foot. It makes the buttonhole the perfect size for the button. You can sew as many buttonholes as you please and they will each be exactly the same. I used it for the buttonholes on this blouse. It did a great job! It is worthy and won't be packed away again. Yeah!
My button sewing technique has improved. After sewing the buttons on, using the Bernnina 930 and the awesome #18 foot, they were finished by hand. For each, I threaded a needle with the two front thread tails, sewed through the button, and took a few stitches on the back. I then tied the threads off, including the two back threads. It took a few minutes to do, but they are secure.
The only other non-machine sewing was the tacking of the back facing to the shoulder seams. It could have been done by machine, but the needle was there and it was just a few stitches on each side. I didn't mind.