Like a lot of people, I learned about soapmaking from her
Soapmaker's Companion, but I'm finding that a lot that I (and others) do contradicts her advice with no particular ill effect.

For instance, she sees rebatching as pretty useless, but it's how I started "making" soap, so that I could play with scents and additions and the like without dealing with lye (I was home with a 2-year-old and 2 cats, so didn't want the risk). I still like it for some of my soaps, because I can use less EO and get a bolder scent.
She says never to put in the freezer, for instance--that it affects the texture. Yet it seems almost everyone uses the freezer to keep soaps from overheating or to get them out of the mold more easily. She also superfats to 10%--eek! She also says that a bar with any "appreciable" amount of cocoa butter has to be cut quickly, because it will set up rock hard. Well, I've make 12% cocoa butter bars and they aren't any harder at the 24 hour mark than my olive/palm/coconut bars.
So what do others think? I love the book, and think it's great, but after some experience (and now finding forums and seeing what others do), I'm taking a lot of her rules with a grain of salt. Or a dip of sodium lactate.