I cannot stress enough the importance of preparation prior to your league’s auction.
Sure, there’s an off chance you might be a special owner who can walk into the auction and steal the show. More power to you. But the majority of fantasy football owners who do not study and prepare before the auction will spend poorly and get stuck with players they don’t really want.
The most important thing you can do prior to your auction is to create a spreadsheet that ranks all the players and also has two fields next to them: the amount of money you feel that player is worth, and the maximum amount of money you’d go over budget in order to sign him.
Then when auction day comes, stick to that spreadsheet and don’t deviate.