So my fwb is moving away on Wednesday, and when we hung out for the last time two days ago, she offered to set me up with her hot friend, (who I’ve never met but seen plenty of pictures of), or at least ask her if she’d be interested. Later that night fwb texted me that her friend was interested and wanted me to DM her on Instagram. Okay, perfect. But I’m a notorious overthinker in unfamiliar situations, and I’ve never been setup before. I can’t decide when I should DM her, (before or after my fwb moves), or what I should say. I know very little about her, but I’ve been the subject of girl talk between her and my fwb, so she probably knows more about me than I’d like. My sister suggested that I just introduce myself (duh) and ask if she wants to hang out in the very first message. I know that asking a girl out right away is a terrible idea on apps, but this is a setup, so maybe that's the best move. I’d be grateful for any advice on how to approach the situation.