I started by removing all of the buttons and finding thread that would work. I chose dark gray thread that I already own. You just need thread that is close to the color of the blazer. The patches were iron on. I also made sure I had thread for stitching on the patches. Elbow patches get wear and tear and must bend a bit. I thought the adhesive might not stay tight. After attaching all of the buttons, I ironed on the elbow patches. I decided after my first wear to stitch around the edges. The patches had already started to lift a bit after only one day. A few stitches helped me feel confident that they would wear well, long term.
It turned out even better than I had hoped it would. It's exactly what I pictured. Business in the front and Bad Ass in the back!