lots of info provided already. Im no expert, but here is what comes to mind for me:
1. Pick up a slate call and box call right away and start listening to the turkey sounds (using podcasts, youtube, etc) to re-create them. Also start practicing with the mouth calls. If you don't get proficient with the mouth calls before the hunt....that's ok, because you still have the slate and box. Id save the box calls for windier days. They put out more volume. The slate lets you do softer more subtle calls.
2. Bring along a hen decoy even if you only run the cheapest ones....that distracts the gobbler a bit IMO and keeps his focus on the decoy.
3. You can locate roosted birds after dark, then slip in before daylight and get positioned. Sometimes very little calling is needed if you wait for the birds to come off the roost and then lightly hen call them to ya.
4. Patience patience patience. Don't overcall (its a mistake ive made WAY too often) and stay as still as possible. they detect movement SO well.
5. the reason its important to learn the mouth calls is because of #4 above. The mouth calls allow you to make sounds without moving your hands, or while holding the weapon.