Cervical feel position? Help?

Star
Okay so I have researched how to do this. (Check my cervical feel position) 
​Today I tried to check for the first time and I could barely reach it with my middle finger. I just don't know whether that's high or not an how do I know if it is soft or firm? 
​How should it feel when I am fertile? How should it feel when I'm not fertile?