Most POAs have back up POA provisions in the text of the document, naming a sucessor POA. Our atty wrote up a short one page document, my husband signed it, and atty filed it at the courthouse where the original had been filed.
I don't think you need an attorney officially - you do need the wording. I am sure that the register of deeds would be willing to work with you to come up with the proper wording, then send you off to do that and get your signature notarized. You will need to pay to file it at courthouse, and for an official copy. That copy can be duplicated and sent to the original party and any business that has used the POA document. That's what my husband did on the advice of the atty.
Hopefully you used the forms that are approved in the state of Michigan. Now it is very important that the forms can be found by the person who needs them. Before you file them anywhere, take them to the MD, the Bank, and anywhere else than transactions are ongoing, city tax, county tax etc. so they can make copies and keep them on file. If you file the original with the county, you may not have it when you need it. Social Security may have an additional form they want filled out.
You don't have to have a lawyer sign off on them if they were notarized, BUT the notary only witnessed the signature, they did not assure it was the right form .
I don't think you need an attorney officially - you do need the wording. I am sure that the register of deeds would be willing to work with you to come up with the proper wording, then send you off to do that and get your signature notarized. You will need to pay to file it at courthouse, and for an official copy. That copy can be duplicated and sent to the original party and any business that has used the POA document. That's what my husband did on the advice of the atty.