1) Do corrections before receiving a bid. For example, check...
i) The title of your auction
ii) The item category
iii) Anything at all about the description
iv) The URL of your photo
v) Acceptable payment terms or shipping information
2) Do corrections after receiving a bid. Basically, there are only two general changes that can be added after you receive your first bid...
i) You are allowed to change the category. For example, you put your vintage Spiderman comic in the “Action Figures” category and then decided it would do better in “Comics.”
iii) You can withdraw your item if you receive new information. For example, you discover that Aunt Mary’s etchings are actually reproductions, even though you heard all your life that they are originals. In the meantime, all your buyers are bidding for originals and the price is much too high for their actual value.
If this ever happens, I would strongly advise you to contact every single bidder, explain what happened, and if possible, offer them something as a consolation. In that way, instead of angry people raving about your ineptness, you will have delighted fans raving about your honesty.