This used to be a big problem for me, then I studied non verbal communication and now Im much much better! =)
You don't want to start making eye contact when you walk towards the girl, instead you walk by like you're going somewhere, then you stop when you're 45 degrees to her (hard to explain, watch how mystery does it). Then you keep stand that way when you open, and IF the opener hook and you see them turning towards you (body language) you do so as well.
One more thing: When you pick a set you DON'T wanna look around for hot girls, that's a AFC trap! BEWARE! Instead you have to "scan" the place very quickly! Style talks about this in his "The Annihilation Method" DVD.
Generally when you open you want to:
1. SMILE

2. Stand up straight
3. Have an open body language (arms down, good gestures when u talk)
4. Look in her eyes, makes you look more confident
5. Kino, most important thing. If you don't do it or do it too late, your stuck in friend zone forever. Start with touching her forearm gently. And remember, you can get away with MUCH more when you don't look at what you're doing. Like putting your arm around a HB when you're both in a conversation with others and you're looking at her friends.
-Good luck!