Trying felting/fulling old thrift store wool sweaters to sew together some slippers for my husband. I've never done this before, and with every spin of the washer, I'm freaking out a little bit more. Don't want to give him something that looks like the cat puked it up. X) Has anyone made these before? I'd love photos/tips/suggestions, etc. Anything to not think about the wool going though a hot wash cycle like one is never supposed to do with a good sweater.