Not just no hair -- also take off all the clothes (just leaves briefs on the males and bra/panties on the females). That can also help when trying to make the needed body adjustments; it's easier to see what your pulling if there's nothing in the way.
It's definitely a learning curve; took me a couple of weeks with the demo before I was able to get it. I'd suggest grabbing one of the Sims that's already in the My Gallery section and bring them into CAS, then practice pushing and pulling to get the hang of it a bit more. Also use the presets that are already in the categories to find one close to what you want, then make small adjustments till you get what you want.
Hope this helps a bit.