Unless the snake is already accustomed to being moved before being fed, you will probably hinder is feeding success by moving him. You could put the prey item on a paper towel or something of that sort like dr del suggested, or if it is live prey, there's no real reason to do anything. Even if your snake does injest a piece of bedding, it shouldn't be enough to harm him. Their digestive systems are made to break down fur and bone; they are able to handle some wood shavings.