Do I need an attorney for probate I Greene County and if not, where do I go to get information and forms to do it myself?

My Mom passed and I am the only survivor in my family. She made her cars ( on the title) TOD to me, both her homes have me as the beneficiary, her will names me as her personal representative and heir, and life insurance policies etc. all have me as beneficiary. The only thing she forgot was to make her savings and checking accounts at our credit union POD to me and they will not allow me access to them without Letters of Testementary. Do I need to hire an attorney?