With some help from my sewing buddy,
I successfully made the buttonholes for my shirt:
It is done!
(thanks to Jimmy for being my fashion photographer for this pic)
I like it a lot, and I will definitely use the pattern (Simplicity 4077) again.
I wanted the inside of the garment to look nice. I really hate zigzagged seams, so I did French seams for the side seams and darts. For the shoulders and cuffs I used Hong Kong finishes. I made my own bias strips from a light-weight yellow cotton fabric. It was more work, but very satisfying.