Try it against your own finger to figure out how it works. And no, for the majority of us (but not all), using the lancet pen is much easier! At least, if you are using a good lancet device. I have the softclix pen and it is awesome.
It takes some time to get the hang of testing. Just make sure you and the cat are relaxed, that you have warmed the ear, that you have a thin sheen of vaseline on the ear to help the blood bead, and that you have some patience. And if you aren't successful and things are getting stressed, take some time off.