I have thought exactly the same thing in the past...and no-one tells you!
There isn't really an answer (groan) - just tilt your head, put your lips on theirs and do what you feel like.
Actually,try this. Give the back of your hand a peck, then keep your hand against your lips and keep trying to peck rhythmically. Then open your lips (as wide as you like). Your lips probably won't move against your skin at all. You'll feel a bit like a halibut, and look like you're eating your hand, but that's about the right effect
Have you actually kissed anyone yet? If not, just go with it and follow your instincts. If you have, you need to be more specific. Don't dribble into the other persons mouth, and don't bite them or anything lol. Again, just follow your instincts. If it feels good to you, it'll probably feel good to them, if you're getting a negative reaction, change what you're doing.
Yep, what everyone says... Don't worry about it, don't think about what you're doing - it will come naturally. Very annoying to hear, but hey, it's true