Hey everybody. It's sad to say I'm a newbie because of how much time I've spent with my head buried in PUA material, but I've just been way too terrified to actually use it, and I really want to try to break out of my shell.

I was getting some new glasses today and I had my sister along with me to help with style advice because I'm pretty clueless in that department. I had a nice conversation with the girl who worked there, and even got her laughing (she remarked on an item number I had written down from the last time I browsed, and I said "yeah, I wrote down the number so I could have my sister tell me if they looked good, and when I put them on, she laughed at me").

I ended up getting a different pair and her and I really seemed to get along well. Of course, in my mind I attributed her friendliness to just trying to sell me a pair of glasses. Once I left the store, my sister informed me that she was watching the whole time and the girl was totally into me. I guess the girl was playing with her hair, checking me out when I looked away, etc. I had no idea (something I really need to work on).

Anyway, at the end of our conversation she made it clear that she would be calling me in two weeks to let me know when they're ready to come pick up. Can anyone help me with ideas on what to do from here? Do I go back to the store (it was at Costco, so plenty of excuses to go back), or wait until the glasses are ready? When I do talk to her... what do I do? Sorry, I just go blank when this stuff is happening to me. Any help is much appreciated.

TL;DR: I'm nervous and awkward, but trying to break out of my AFC shell. I was informed after a trip to pick out new glasses that the cute girl who was helping me was interested in me and I could have gotten her number. I had no idea. She will be calling me in two weeks to come back in and pick up the glasses. What do I do?