Had no idea this was even a real thing until someone in a finance thread mentioned it. Figured writing out exactly what happened might help someone else in the same fog.
Step one was checking what the current rate actually was. Pulled up the original loan paperwork and it was 13.7% from dealer financing two years ago.
Step two was figuring out what rates were even available. caribou shows competing lender offers without a hard inquiry upfront, which is useful for anyone who doesn't want to commit to anything just to see numbers. Offer range in that credit profile came back around 7%.
Step three is accepting an offer and submitting the actual application. That's where the hard inquiry happens. New lender pays off the old one, paperwork gets signed electronically, and the new loan starts the following month.
Total timeline from first check to new loan is usually around 10 days. Old loan paid off, new rate, same car.