Sc53,
Log on to your account, then click on,"help" @ the top right corner.
Then,
Under catagories click on, "Getting started",
Then,
Click on, Premeir & Business,
Then,
Scroll down the column of questions in the right hand column untill you see,"Can I downgrade my account?" it's
near the bottom of the list of questions.
And then just follow the instructions on the right hand side of the page.
P.S. With the personel account,(basic), you are limited to
Transactions of $1,000. or less. So with sales above that you, or your buyer's, will have to divide the $ into two or more payments depending on the amount.