Another question. Will a 0 clipper shave give me a really good idea of what my head shape will look like bald?
Look like, yes. Feel like, no.
There is nothing like the smooth slick feeling of a shaved head.
The #0 clipper leaves a velvet or fuzzy feeling. Shaving leaves a very smooth feeling. Get yourself some clippers and shave your head to experience this feel. Then keep that up for 30 days and you won't want to go back to hair again.