It really depends on the party!
Kissing him will feel more natural if you gradually move a little closer to him.
Also, right before you lock lips, tilt your head to the side a bit.
Kissing boy and girl vector image
Exfoliate your lips and apply a neutral lip balm before you see him so that your lips are kissable and soft.
Many people don't feel comfortable kissing in front of others, so don't let someone pressure you to.
Description: If it seems like he's enjoying it, you can ramp things up a bit.