I often find that my reputation has preceded me when it comes to women, but it's never because of my big dick or awesome cut body (obviously.) It's because I give awesome oral.
And it all started with the alphabet trick. The key is to keep it as random as possible and to do until your tongue falls off, as long as they want it.
Do's:
Randomize
What I call the 'Beethoven'- big wide tongue all the way up a couple of times, like a big slobbery dog
turn your head for a new angle
be aware of her sensitivity threshold
nibble (a little)
be aware that her clit is not the only source of pleasure
lick the labia minoris and majoris
lick and kiss all around the goods
start gentle and become more aggressive, then gentle again etc.
communicate, ask her what she likes best
VARY YOUR SPEED, AGGRESSIVENESS, PRESSURE AND MOTION!
Don't
avoid falling into a repetitive motion
don't' be tempted to hammer her clit to much because she starts moaning, just because you can get her to cum doesn't meant there isn't a better more satisfying way :)
avoid beating her clit to death
Good luck :)