Auction sales move along fast. That is one of the reasons why I told you to do your research. You have checked out 4 or 5 vehicles, you know what kind of equipment they have, you have heard them run and you have also have a pretty good idea of what the vehicle is worth. Decide how much you want to pay for each choice and then you are ready to proceed.
All the vehicles with auction numbers that are in the yard on auction day will be driven through the auction ring. This is where the actual auction takes place. The auctioneer will ask for a price if no one bids he will back up to a lower price until he gets a bid. once he gets an opening bid he will ask again for a higher price until all bids are in. (Now if the vehicle is unreserved, it will be sold to the highest bidder.)
If the vehicle is a reserved vehicle the auctioneer will get the highest bid and ask the owner if he will accept the bid. (If the owner accepts the vehicle is sold.) (If the owner does not accept, the auctioneer will say that it takes more money.)
At this point you are free to ask the auctioneer or ring man how much it takes to buy the vehicle.