How long did it take for you to get used to things being in your vag?

Cat
I want to be able to check my cervix. I've been doing it for 3 days so far. And I find myself nervous about sticking a finger in me everytime so basically everyday I feel a little less motivated to do it. It doesn't hurt but it is uncomfortable and makes me nervous. I worry about hurting myself. 
Advice? (Besides the advice of just don't do it because that's impractical. I'm doing this not only for my crevix but also to get used to it so tampons and sex and doc visits will be "easier") Tips? Nice words?