Be prepared for the weather on the day you hunt. Don't spook your bird trying to set up on him. One hundred to one hundred fifty yards is close enough. It is too close in some situations. If there is an opening near to your roosted gobbler, he will probably go there when he flies down.
Turkey hunts are never perfect.
Always expect for sometrhing to go wrong. In most cases, the dominant gobbler is not the biggest bird in the flock. Turkeys live in flocks. Flocks travel and feed together. Turkeys like being with other turkeys.