how do I relieve tension in my throat and chest to prevent blocks?

how do I relieve tension in my throat and chest to prevent blocks? what should I do to prevent blocks from occurring, I'm hoping to talk to this girl I recently met on Tuesday and I want to say "hey [name], whats up" but I'm scared that I'm gonna get all frozen up scared of what she's gonna say that I won't try anything and ill just be sitting there for too long without saying what I want to say.