LAST EDITED ON Apr-29-15 AT 07:59AM (MST)[p]It is difficult, but way more rewarding than using bait.
Try to find natural food areas, and either still hunt into them, or use spot and stalk if you can see them from a distance.
Another method is to try and call one in with predator calls. This can be pretty exciting, because some boars will come in pretty fast with the intent of killing whatever is making the cries. Be careful they don't circle behind you. They'll catch your scent, and be gone.