Dude, if you wanted to learn how to do a standing back flip , you'd go to a gymnastics coach and ask.
He'd say "Swing your upper body backwards and kick your legs over" (or whtaever the fcuk he'd say).
But you wouldn't be able to do a backflip from that.
Broadly ,
Even if you don't have eye contact , if the woman has noticed your presence you can , from that point on go up to where she's trying to choose between brands of liguine (or whatever) and say something hilarious (it's best if one of the brands of liguine is under a brand name that rhymes with a part of the female anatomy but otherwise you'll have to think of something fybnny to say yourself). From that point even if she likes you you'll have to carry the conversation for 2 or 3 minutes.
The best way to get good at this is practice.And it's scary.
Good hunting to you.