I agree with Attorneys Bell and Scholl. Unless the power of attorney is a "springing" power of attorney (which comes into play when a person is incapacitated), the power of attorney is likely to come into existence as soon as it is executed. Please have your attorney review the document and confirm that it will be effective upon signing. Good luck to you.
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A Durable Power of Attorney can become effective immediately upon signing. The "durable component" does not refer to when it becomes effective, but rather specifies that the powers granted will continue even after (if) you become incapacitated.
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Aside from a springing POA, one method of protecting your self while still competent is to execute a power of attorney, but not deliver it. Tell the person to whom it is granted how he or she can get it, should it be needed. That way you are not giving them control now but its is there should the need arise. If you cannot trust the person with at least that much information now, then I would rethink granting him or her a POA.
All responses to these questions are meant for general purposes. Outcomes in all legal cases depend on combinations of many factors, facts and details which cannot be adequately discussed here. No attorney client relationship is created or intended and I strongly recommend that you actually consult with an attorney before deciding on any course of action.