If you are using a large corral type trap, I set up a feeder and let it go off at regular intervals to get them used to the food source. When I'm ready to set it I put some in the very back to make sure I get as many of them as possible in the trap before it triggers.
I’ve trapped a lot and I always baited them up in a likely area , trail , rooting , whatever that may be . After they find my feed I’d set trap and bait it for several days and let them get use to going in and out and then set it . Pretty simple , and if they haven’t been trapped they are usually pretty easy to catch . Some people say they get trap shy after seeing their buddies caught but I’ve personally caught the same hog 2 nights in a row in the same trap . We trapped them for meat back in the day before it was a crime to release one . If we caught more than we wanted to clean or one that was rank or pour we let them out .
I usually put about 1/2 bag of corn (25lbs) or so in my traps. I dont sour it but I do put some grape kool aid powder on top of it or a mixture of chocolate syrup, cooking oil, imitation vanilla, and a box of choclate pudding to thicken it up some. Both the kool aid n choc mix have worked well for me.