The word refinance means to borrow from a lender with lower interest rates to pay off those loans with higher interest rates. In the long run this will save you a good deal of money. If you feel you are paying to much for your current loan, then refinancing may be the path for you to take.
To maximize the amount of money you can end up saving, be well aware of the term of your current auto loan contract. It is possible to extend your car payments for a longer period of time as a way to lower your monthly payments. But doing this will cost you more because of paying interest for a longer time. If you purchased your car when interest rates were high, then refinancing when the rates are low will save you money for sure.
Much of the auto loan research can be done online with little effort and it could be an effort that will save you money. But if doing the math yourself is not your cup of tea, then speaking with a broker can take the work for you. He can tell you the best loan that is possible.