I have a few totes I use for wolf traps that have a gasket on the lid to keep airborne contamination to a minimum. I keep gloves sealed in pairs in Ziploc bags with a pinch of baking soda inside. Never touch canine traps bare handed or with "dirty" gloves, I try not to spit, sneeze, cough, or sweat near my sets or traps. I try not to touch anything at the set that I don't have to, and spend the least amount of time at the set as possible (set the trap, prep bait, etc a good distance away, then approach the set location). I also keep my mouth closed while setting so I'm not breathing Copenhagen all over everything. Also don't like idling a snow machine or truck (whatever you're using) near sets either, and I'm careful about exhaust smells on any gear I'm using for canids
This is a good advice, although I've not seen the totes with gaskets, I just use regular totes, but hang my traps out in the trees away from the house after they are prepped in the off season. I have went to using the 7 mil disposable rubber gloves you get at Harbor Freight (the 5 mil ones feel way thinner and I rip them constantly when making sets) rather than regular gloves. Grab a clean pair of gloves and make however many sets you are going to make at a location when gang setting, then go back through and lure all the sets with a different pair of gloves (or that pair, but then they are never used to handle equipment again) when you are done rather than changing gloves at each trap. When making snow sets I switch gloves if I get any dirt or debris on them, even though they may be scent free I want clean, white snow at my set, no dirty snow to attract their attention. If I have any suspicion the gloves might be contaminated, or after setting a few traps, those gloves become lure gloves, then after they've been used for that a while or if I'm handling bait directly with them, as soon as I switch to making non baited sets (I don't want strange odors like bait odors at a pee post, for example) they get discarded (or possibly saved for handling trapped animals, skinning, etc.) I always use gloves when luring sets, I've always wondered about the videos where guys will stress scent control, use gloves and a ground cloth when making their set, then peel their gloves off and grab a stick bare handed, dip it in the lure bottle and place it at the set. You've just introduced a bunch of human scent directly on the object you are using to attract the animals nose. When trapping areas where the animals are used to human traffic, logging roads, snowmobile trails, (probably farm roads in your instance) the animals are used to human scent being there, fuel scent, vehicle exhaust, humans walking down the road, etc. whatever is normal for the area shouldn't spook them, but anything abnormal like your scent walking twenty feet off the traveled route, or a vehicle stopping and idling will put them on alert. If I stop where I have set I immediately shut whatever vehicle I am using off, and don't start again until I am ready to immediately drive off.
Like others have said, some animals aren't wary and you can catch them without all these precautions, but not the wary ones. But make all your sets for the wary ones and they'll catch the unwary ones also. Just don't spend too much time at a set being too anal about scent control or you will defeat your purpose by dispersing your scent everywhere just by being there.
As Yes Sir says, human scent dissipates with time, do what you can to eliminate leaving it at the set, but often times your best course is to make the set a few days before you expect the animal to come back through and time will dissipate any incidental human scent you left before the animal visits the set. And if at all possible check from a distance and don't spread more scent at the set when checking. I might drive right next to a set if it is on the edge of the road (or directly over it in the case of one set in a snowmachine track) but they expect to smell vehicle traffic on a road and as long as you don't stop, you don't leave any abnormal scent. This could work for walking also, if you are making sets right on or next to your trail where you pack bait in to a baitpile (what Boco calls a jackpot) don't change your route, continue to walk in the same trail, even if you have to step over your trap, the animals are acclimated to your scent walking there and any deviation you make may put them on alert.