Yeah, Hoborobo - Take Maggarg's advice.
Not the stupid sarcastic part.
The part deeper underneath, which you can only get by reading into the gaps and silences of his post.
Don't hesitate. Every second you hesitate, you crumble your confidence more. Don't ask a friend to do it for you, it's your battle to face. A good way to do it is to psyche yourself up during the entire day (kind of like killing cows to get your blood up), and then confront her at the school gate. However, remember to act casual. When you've psyched for an entire day, you may find yourself going "Heyyy hows it going good I'm good so wanna go out, like, with me for real like?" Take it slow, take it easy, but don't hesitate. Seriously, for every second you spend in idle conversation, the more your resistance crumbles.
Commit yourself. If you've "already put on the war paint" then you can get through it a lot easier. A good way to do this is to simply ask to talk to her. Not alone, she'll take the hint for that enough. Lag behind her friends, and ask to talk to her. Once her friends start giggling, and she comes back to talk to you with a gigantic grin on your face, there isn't much else you can say - so say it.
That is obviously what Maggarg was trying to say. You just have to understand what he's saying behind his sarcastic and ironic exterior.
... He also likes eye of the tiger. A lot.
P.S. Are you actually taking in any of the advice we're giving you?