I have a different hair type than most of the posters on this
thread, but I wear my hair very short. In my case, my hair
turned out curlier after I chopped it off. So what? I don't
understand why everyone keeps bringing that up as if it's a
negative thing. Your hair might be curlier, it might look almost
straight depending on your hair type. But, as long as you get a
good cut with a good shape, it will look great.  I think you
should go ahead and do it. It's only hair, and you can always
grow it back out if you don't like it. Since your hair is
already bob-length, it won't take long at all to get it back to
to there if you don't like your pixie cut.