I’m extremely nervous and don’t really know what to expect once I’m in my polling place
Understandable to be nervous, but you’ll be fine! There’s always a lot of signage of where to go, and the people will walk you through what you need to do. The process is intentionally accessible to people who are probably much less capable than you are.
Is there precedent for casting a vote in the general election after election day in the United States?