Just wanted to add that its probably best for GO's to bid on at least 4 people, if you place a bid and don't win it, you will likely want to have backups. Placing bids costs nothing, but winning the bid requires you to pay up.
It is assumed that if you do not get one of your picks, you will have to choose from the people whom were not bid upon(or took a back seat to other bids that happened to win) to replace it.