You need to file in the county in which he lived in the state in which he lived. You do not need an attorney to do so and many courts have easy forms and pamphlets to help open probate and file the will for administration.  Review that court's requirements and call the court clerk's office. If you still feel uncomfortable doing so without an attorney, then consider consulting with an attorney in that state who is experienced with estate and probate law and out of state beneficiaries.