It's not a dumb question at all. No, if you just wet it and let it dry, it will not keep its shape. I think for that, you have to steam it, but very gently and without overheating it. Acrylic yarn is plastic and it has a memory. If you steam it while blocking, you basically tell it; this is the shape i want you to keep. But i can't tell you how hot the steam needs to be and the specifics. For instance, i don't remember if you have to touch the yarn with the iron or just steam it while hovering over it.