First survey your subject. Move in slowly.
Make your first move quickly and adeptly.
Worry not about squishing eyes or other facial parts.
Be prepared for subject to apprehend you with cute looks.
If necessary, steal kisses from whatever body part lands near your mouth.
Bellies are fair game - especially during a tummy ache.
If subject places finger in mouth - kiss it...
... just don't bite it - or you may get a surprised expression from subject.
Be prepared for erratic movements of newborn subject. Capitalize on the opportunity to kiss the elbow.
And always let mommy steal her kisses, too!