trim a bit of the stem off because it's not very comfortable having it there, leave a little bit.
put it in wet to make it slip in more easily. There are instructions in the box about how to fold it to put it in. It's not big when it's folded up.
When you take it out you can either just grab and pull or you can help a bit by pushing with your vaginal muscles.
the first few times as you get the hang of it you might spill a bit when you take it out, so if you have carpet in your bathroom then do it in the bath.
It honestly only took me one period to get the hang of it.
Catgirl- the funny thing is that I find it has made me less squeamish about menstrual blood; it somehow seems fresher and less yucky than it used to when it was on a tampon or a pad.