An appointed Power of Attorney Property Duties will manage your financial affairs and make legal decisions for you with respect to your physical assets. There are usually no limits on what the power of attorney property care can do, except that your power of attorney for property cannot make a Will for you, change your existing Will, change beneficiaries on specific insurance products, or transfer his/her Power of Attorney for Property duties to someone else on your behalf.
Depending on the wording of the Power of Attorney document, the Power of Attorney Property Duties gets immediate authority. It is common practice, however, that if an institution is approached by your Power of Attorney for Property on your behalf, they will require either proof of your incapacity to make the decision or your consent. You can continue to manage your own affairs, as you always have, and your Power of Attorney document will just kick in if and when you need it.