If you need advice that particular kind of DIY, feel free to post here and tag me or DM me directly. Hopefully I can be very helpful to some of you folks who either can't afford to pay expensive mechanics or want to learn on your own.
I work as an independent mobile mechanic in middle Tennessee (for now). My primary work is motorcycles and small engines, but I've done plenty of work on cars too. I used to post quite often on r/fixxit back before I left Reddit.
Pic is an example of my work. That's one of my motorcycles, which I resurrected from the dead. I took that picture while was riding to the small town of Cave-In-Rock, Illinois, to rebuild 4 carburetors for a customer, and in line waiting on a ferry to cross the Ohio river.
Ah, shoot, forgot about that.
If it's a traditional lead-acid battery and is also the original factory one, just replace it. Lithium batteries are great as they save a bunch of weight, but they're expensive and don't handle the cold as well.
I can't tell you how much I appreciate the guidance and thoughtful responses. I'm not in a position to start getting it going immediately, but will reach out (if you'd like) once I start on her. Thank you again for your time and knowledge-base.