If one gets a DUI, is getting a lawyer the best thing to do?

If one gets their first DUI, was pulled over for turning into the wrong lane, blew a .13, and has a clean record, is it worth paying the money for a lawyer? Considering one also is a college student in good academic standing, and works for a school district, is that enough to get the best deal one can get from a judge with no need for a lawyer?

*also, the first cop who pulled one over initially was going to let one go, and it wasn’t until the sgt showed up and decided to further investigate, that the DUI was then administered. Is this something a lawyer could work with to completely get one off the hook?