"Jesus, Steve, it's not like I went diving in the Mariana Trench, I'm fine." Totally fine, and if he's shaking a little and can't quite bring himself to stop touching the arc reactor, whatever, no one's perfect.
(This is how they piece it together and make it work.)
Tony Stark receives an invitation to Steve and Bucky's wedding. He has absolutely no idea who they are. For their chutzpah, he decides to pay for everything for their wedding- and hop into the planning to make sure they get the best of the best.