advice needed!!!

[PureChevy]

I have been trying to sell my camaro for a long time, finally someone is buying it. It has a lien on it. I signed a power of attorney for them to transfer the title and lein. His bank will pay off my bank and then cut me a check for the rest. My question is, will the bank do some sort of Bill of Sale, or should i do one and have him sign it when he picks up the car. I just want to make sure that everything get s done right.

thanks