Can I set the price I’m willing to sell at?

Yes, this is called the reserve price. Your property will be offered subject to this reserve price, and it is kept confidential between the seller and auctions team. It is usually set just prior to the auction and is a figure below which the auctioneer cannot sell the property during the auction. If the property fails to reach its reserve, offers will then be invited from all interested bidders to try and agree a sale after auction at or above your reserve.