ORIGINAL: Greg / MO
Also, I've got a LOT of experience in this type of hunting... it really depends on what you're after. I've seen mature bucks enter the fields with shooting light left, but just as often they'll stage back in the woods and hit the field edge right at last light.
Good poing Greg.
If you aren't seeing the mature bucks entering the fields with ample shooting light, don't bother wasting your time. You might have to get agressive then and move back into the staging areas.
Being that your season opens up the second weekend in September i don't think you will have a problem with bucks not showing up until after shooting light. They should still have their guard down assuming they don't get pressured before season.
Also, like some others have said, pay very close attention to how you get in and out of your set. It might be difficult to get out after dark with all the deer feeding out in the field so be prepared to stay out for a while, which by the title of your thread i can tell that you have already thought about that!