When I block real wool, I just wet/wash it, and lay it flat to dry. I usually knit on larger needles even for lace shawls, so don't need to stretch them. The acrylics I just put in the washer/dryer and they're fine, sometimes the stitches even relax a little so you get some of the same effect.
Jan, I was really sort of kidding, but yeah, they would be perfectionists.
sue- knitting heretic