One thing about felting is even using 100% wool yarn does not mean they felt at the same "speed" so to speak. For example, I found Paton yarns felt really fast, learned that one the hard way ending up with a handbag for a doll (not quite, but you know what I mean!
) and the Knitpicks yarns seem to take quite awhile to felt. I always machine felt, with hot water, a tiny bit of detergent and I use old towels instead of jeans. I know some people like to hand felt, but seems a lot of work to me so into the machine it goes! lol