I know you're all worried about kissing, but really, worrying isn't going to help you with your first kiss or kissing at all. If your lips are too big to kiss, will that really stop you from trying anyways? If you have bad breath, will you be destined to never kiss anyone? Regardless of the answer, it won't stop you from trying to kiss someone.
Want my advice, plain and simple? Stop worrying and just do it. You'll fumble up everything if you're nervous. Just take it easy and keep it simple. Don't go for extreme tongue aerobatics or anything.