Legal. As long as it is signed, witnessed and in some states notarized by the person of sound mind who is executing the document ~ recinding all previous documents/wills. Trouble often arises because different states/countries recognize different forms. And boiler plate forms lack the specifics for each individual. In the U.S. a will automatically trigger probate. To avoid probate and the huge fees/delays associated with probate a will is usually a part/exhibit within a Living Revocable Trust. Best resource in the U.S. for self-help legal is www.Nolo.com or www.NoloPress.com.