The answer is different in different states.
You have a NV answer-in Florida the answer would be 2 witnesses and a notary.
The answer given does not imply that an attorney-client relationship has been established and your best course of action is to have legal representation in this matter.
It would be foolish to execute *either* of these documents without consulting with an attorney . . . there are serious consequences to their existence.
I agree that these forms should be notarized, but no witnesses are required. Typically witnesses are only required for a Will and a Living Will a/k/a/ Medical Directive.
I am licensed in Nevada. The above information should be construed as legal recommendations only and not legal advice.