Pressured big-game animals have a nasty habit of disappearing by going nocturnal, burrowing into the nastiest cover they can find, or simply moving on. Pros can hit what they aim at. Pros can get to the game. If you can't cover ground and get to the game, you'll never get a shot. Start well before the season exercising your legs, lungs, and heart.
Pros are flexible.
The most successful hunters are those that can go with the flow, altering their plan of attack as conditions dictate.