One thing to consider when hunting on the ground, is making yourself as comfortable as possible. Anything you can do to fight off the fidgets, dead-legs, or wet hind end will help you sit as still as possible. It's a well known fact that it is much harder to sit still when one is uncomfortable. Take this into consideration when making a ground setup.
For that matter, its something to consider from the trees as well. It takes a little extra time but it could be the difference in success or failure when the moment of truth comes.
Good luck, Landon.
Jake