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If you do prepare your will outside your domicile, make sure you have it notarized. Although a notarized will is not necessary to make it valid, it is necessary to make it a self-proven will. This means if it becomes necessary to probate your will you will not have to call the witnesses to court to testify about your mental state when you prepared your will. If these witnesses live in a foreign state it creates additional problems and expense for your executor or administrator to bring them to court.