Looking into credit unions to refinance my car (suggestions or tips)

Hi friends. It’s about that time when I’m looking to save myself some cash every month and lower my APR on my current vehicle. I’ve done research seeing all the details about what they take into account and my credit is not bad. I’ve spoken with people and I’ve got local credit unions recommended the most, anyone have any tips or past experiences with this? Looking to get the lowest rate possible. Any suggestions on unions or places I should seek? Anything helps, thanks!!