Get the wind in your face and cover lots of ground until you get into fresh sign. Stop and listen often. When close, you can smell them or thier beds. When moving in on hogs you can move pretty fast until you are within 50 yards or so. They make a lot of noise, so you can get away with a mistake or two. Low and forward is the best shot. I like to hit a broadside pig 3-4" above where the center of the leg meets the brisket. If you jump a group that are bedded immediately nock an arrow. The spooked ones will often circle down wind to figure you out, and offer a shot. Lots of times others will be nearby that didn't jump, so be ready.
I'm only a rank amatuer hog hunter! I've been fortunate to hunt with some really experienced hoggers though, and Robert (RC) is one of the best.