I'm not sure exactly how to determine things like high vs. low, or open vs. partially open vs. closed. Firm/soft I'm not as worried about since I do have the reference point of firm = closer to the feel of the tip of your nose and soft = closer to the feel of your lips.
I know that cervical position is a secondary, optional fertility sign.

I am a lot more concerned with cervical fluid. I figure it can't hurt to learn though.
So, how open does it feel when it's "open"? How much does it need to be to be considered "partially open"? Etc etc etc.
Thanks!