Man, the hardest part was sewing in all the ends. I don't sew-as-you-go, so it was hours and hours of sewing in stupid little ends. Once that was done, I sewed the two pieces together during a movie.
I found small, square red buttons a Joann's that worked well with this design/color.
I worked this project on 14 count Aida cloth and it's quite large for a pincushion, ~ 4 in x 4 in. I would recommend stitching it on 16 or even 18 count.