Sorry to tell ya this but every hog showman would LOVE to win a grand champion. I've been showing for 2 years now & haven't won one. I show in one of the most competitive shows in the area and it's TOUGH to win big.
I guess some advice is never to give up hope, make sure you've got a good muscled pig with good bloodlines. Make sure that you're excersizing your animal twice to three times a day. And also feed them good feed, not just the cheap stuff. And love them. Pigs are just like dogs and love to be thought of.
Hope this helps!!