I have never heard of a sharp hook! I made holes all around the card (same number each side) with a large, sharp needle. I then enlarged them slightky with a small-gaauge knitting needle. I crocheted the trim with my trust Victorian steel crochet hook that I bought in a junk shop. The hook is very pretty, it has two decorative knobs on the end, and the shaft is chased with designs. It has a good feel, and I use it a lot.