dustin them is just fine for firstpoints.
i have only been knaping for about 3 months now,and my first obsidion point was thick also
then i switched to chert,got a little better and learned afew things,went back to obsidion cause i ran out of chert
i learned with obsidion that you need to use alot less pressure or you just crush your platforms when trying to pressure flake them.
now my obsidion points are getting thinner and better each time i make em.
keep it up and in no time at all you will surprise yourself on how thin you can get that glass without it shattering.
peace,
tim