Katy, above all, we have to have confidence in who were are. In our particular case, we're women. We're no better nor worse than every other one out there. We're inexperienced, yes, because we didn't grow up as women. (I look at it "entering the game late".)
Your observations of how other women interacted is just part of your "education" and should in no way rattle you. Actually, I think that it's quite the opposite. Do men look at and judge each other on their presentation? No in most cases. But the reverse is true for women. The fact that you were observing and picking up on their cues probably in some small way proves your feminine ways.
I don't think that it should vary your timing to "jump in with both feet". Yes, most of us will end up doing just that, but it should be done only when we think that we're ready. I've thought a lot about that, and one has to be "psyched up" to do it, lest we go out unprepared.
Good luck to you, Katy!
Marie