Kissing successfully is the mastery of LISP: Lips, Inside, Speed and Presence.
Study my guidelines below, ignore your instincts, and your lady will be happier then a rabbit with a carrot.
Lips: Make sure they're not chapped or dripping with gloss (though, if anything, caution on the side of well-lubed). No one wants to kiss desert lips.
Inside: The tongue is a powerful tool but must be used properly. It's to be used for soft poking and swirling; it is NOT a strep throat tongue depressor.
Speed: Kissing isn't a race but isn't time for a nap, either. Keep it steady and vary your gears. This will keep things dynamic
Presence: This is the final tie-in. All things mentioned above must be adhered to with a sense of being "in the moment." Be alert ,dude: If she's gagging, pull back ; If she's enjoying something, stick with it.
That should cover it. Now put down that ice cream cone and start LISPing.