Hi ladies I'm mostly done on this very pretty shawl http://crochetvolution.com/archives/fall-2012/butterflies-shawl I was just going to add a little more length, then was reading it grows 1/3 during blocking. I've never blocked anything before and don't know if it's necessary? The shawl seems to drape very well and hangs nicely. So, what's the purpose of blocking and do I need to do it? Would I regret not doing it down the line for any reason? Thanks for your expertise!