ok guys, I did it. I changed the oil! It was awesome!

Only one thing went wrong.

The oil cap (where you pour in the oil) has a small rubber ring that goes with it. It's a seal. We lost that. The cap still fits on tight. I'm wondering, should I replaced said seal? I mean, it dosn't do much. DIfferent people say different things, but the feedback I've gotten is: "Look and see if it leaks, then replace it".