Any plastic or metal fingerpick is going to hurt if you have a hangnail or if you form them too tightly. Plasic ones need heat and pressure to form, metal ones just pressure. Get a dowel the size of your finger to form the pick around (Dowels don't give, fingers do) and then slip the pick on the appropriate finger. If it feels too loose, squash it a little more until it feels right. Buy extra picks if you screw up.