OK
1. How perceptive are you? Analyze for body language. Does she seem timid? Overly confident? Quietly confident but pleasant? Modify your opener to suit the girl. This is a funny little bit I like to use for overly confident girls in this situation.
Walk up to her after she's bought her ice-cream:
You: Excuse me
Her: *Some sort of acknowledgment of your existence. If she doesn't, just continue*
You: What flavor is that?
Be extra careful not to notice her beauty in anyway. Just pretend like you're infatuated with the ice-cream (lol)
Her: Um...strawberry with a flake
You: You know, that looks damn good, i'm gong to get one.
If you haven't checked her out in this period of time, her confidence will go down. Especially since you seem stoaked in the ice-cream and payed little to no attention to her. Sometime I even just look at the ice-cream and not look at her at all. That look of disappointment and confusion on some of their faces is priceless!
You (returning): *eat a bit of the ice-cream as you walk over* mmm...you know this IS good. You have good taste (no pun)...' and then just ease into conversation. OR you could reply 'Actually, you have horrible taste, this is disgusting *beam

*'. This is funny because ice-cream tastes awesome and she know's you're not cereal.
ANYWHOO, a little off-track there..
2. Don't over analyze, please. If anything this is shooting you in the foot. Chicks have a sixth sense for these things and can usually tell if you've spend the last hour huddling in the corner trying to thing of the perfect opener. Imperfection IS perfection!
3. You'll know when to slow clap when the time comes

Instinct man, instinct is your friend.
4. Be energetic, not hypo, but energetic. Be confident. You're INVITING her into YOUR world! She should be grateful that you chose her ffs! If she shoots you down, obviously she not worth being in your world.
Oh and one last thing. Guys remember to be nice. This is a community of alphas. People trying to better themselves through this brotherhood. Play nice and help fellow travelers along the path to self-improvement. Pussy isn't the goal here, it's just a nice little bonus
Peace
Skittles