Earn the trust of the person making the will. Generally, a person will want to name someone as executor who is trustworthy and will faithfully perform his duties as outlined in the terms of the will. The testator, or person making the will, usually designates a spouse or adult child as executor but may also designate a friend, extended family member, attorney or financial institution.
Agree to accept the duties of executor when asked by the testator. A person who is named in the will as executor has the right to refuse the appointment upon the death of the testator. Therefore, even if the testator desires to name you his executor, unless you agree to take on the responsibility, you will likely never be appointed by the court to act as such.
Petition the probate court, upon the death of the testator, for letters testamentary, which is a document signed by a judge appointing you executor of the estate. Before letters testamentary will be granted, however, you must have been named in the will as executor, and until the court issues letters testamentary, you generally have no or little authority to act in that capacity.