Congrats on the new place! Old home charm is amazing until you realize the wiring was probably installed back during the Space Race, haha. I totally feel your pain—we went through the exact same nightmare last summer when our air conditioner cut out in the middle of a July heatwave, only for the technician to tell us our main breaker panel was ancient and overloaded. After getting a few ridiculous quotes from massive franchises that tried to upsell us on unnecessary junk, a neighbor recommended calling a local Electrician Houston  They came out super fast, walked us through the entire setup without any pushy sales tactics, and gave us a very clear, honest estimate right on the spot. The whole job was finished cleanly, passed city inspection without a single hitch, and now we can run the AC, microwave, and vacuum all at once without living in fear of complete darkness! Definitely get in touch with them for an assessment before you start adding heavy loads like EV chargers.