No. While a last will and testament may determine how your assets are distributed at your death, it offers no assistance to you during your lifetime. In particular, a power of attorney and a health care proxy are essential to ensure that someone will have the ability to make health care decisions for you, pay your bills, and manage your finances if you lack mental capacity to do so during your lifetime. If you do not have this documentation, your loved ones will be forced to commence an expensive and possibly contentious guardianship or conservatorship proceeding to be empowered to manage your financial and health care affairs.