I have several years of trapping and have trapped hundreds of animals, fox,coyote, bobcat, mink, beaver, muskrat, and racoons.
Although it's a good thing that more people are going to become interested in trapping because of the wolves, I think they need to start on some smaller animals and get some catches under their belt before they jump into wolf trapping with both feet.
Wolf traps are no joke, jaw spreads up to 9" and higher hanging snares. Traps need to be solidly anchored, with multiple swivels. A trapper has to know how to release non target catches without injury to himself or the animal. k-9's are very tough to catch, very trap smart.
As far as the question about marking your traps, with k-9's you can't visually mark every trap, they will get stolen and it would cause hesitation from the animals. I mark mine on gps to keep track of where they are and use the fish and game sign (I laminate mine) leading into the area to let people know there are traps in the area and how to release their dog safely if they get into one. traps in the water are easier to mark with flagging, most people won't bother wading in or busting ice to steal my trap when it's -10 degrees. Those big bear traps you're worried about are illegal, and you can't use any traps with teeth on them. I have caught my own arm in conibears and my hands in leghold traps, it hurts but doesn't cause permanent damage and have always been able to free myself.
Again, I encourage ethical people to get into trapping, but don't get in over your head, start small and figure out how to handle foxes, coyotes etc first.
Bearpaw Outfitters
Urge 2 Hunt
Jokers Wild Outdoors