Power of Attorney to be used Exclusively for Dealing with Shares in a Corporation.
Your will must be witnessed, usually by two or three people, when you sign it. These witnesses must also sign your will. It's advised that the witnesses not be beneficiaries; they should be impartial (they have no financial interest in your estate). Self-written and self-executed wills run the risk of being improperly witnessed and therefore can later be declared invalid. If you are a do-it-yourself will-maker, be sure you are following correct witnessing procedures.
Your safe-deposit box may be the worst place to store your will, depending on the laws in your state. In some states a safe-deposit box is sealed with a person dies and it takes a court order to get it opened. Call the institution where you have a safe-deposit box and ask what your state laws are before you deposit the will in the box.
You can change your will at any time either by drawing up an entirely new will or by adding a codicil (a supplement to the will that alters its original provisions). In order for codicils to be legal, they must be executed and witnessed in an appropriate manner. Don't try crossing out things in your will or writing in corrections; those kind of changes could make the entire will invalid.
It's a good idea to review your will periodically, at least every three years or so. However, you should always review it when there is a major change in your life; when you get married or divorced; when one of your beneficiaries dies; when you inherit or purchase new property; when your assets substantially increase or decrease; when you move to another state; when your named executor is unable or unwilling to serve; when a change in federal or state tax laws affects the provisions of your will.