You may wish to provide a photocopy to the agent. A power of attorney must be revoked in writing and the revocation must be executed in the same way as a power of attorney. A new power of attorney will revoke a previous power of attorney unless the grantor provides that there shall be multiple continuing powers of attorney. Some people are drafting their own powers of attorney using government kits or purchased forms. It is not essential to retain a lawyer to draft a power of attorney.
Old forms provide for only one witness.
A power of attorney appointing a spouse as agent should not be executed if the marriage is even slightly unstable. An agent may be able to abuse the power of attorney clearing out the grantor's assets any time after the power is signed. Grantors using the government kits should be cautious about filling in all the blanks or spaces. Unclear conditions or restrictions may severely limit the use of the power of attorney. Conditions and restrictions should be drafted by a lawyer if they are used at all.