I have noticed when I talk to girls that are interested, they lift their arms up and shoot their chest forward. And usually yawn a littlebit so it's not obvious that she is showing her wares. Funny to observe. And a good sign to escalate.
I could talk to any woman I wasn't attracted to. Charming, funny, relaxed. Then a gorgeous woman looked my way and I'd become a sweating, babbling mess.
The fix took me years to find and ten minutes to learn. Nervousness and excitement are the same physical state — pounding heart, adrenaline, flushed face. Your brain just picks the label. And you can pick a better one.
Rule 16 shows you how. You feel the nerves, relabel them as excitement, and let that energy pour out as enthusiasm. Women notice the guy radiating it. They always do.