Keep a set of coveralls and work gloves in the rig with the chains so that you are not afraid to lay down in the snow and slush to get the chains on. Best way to install them it to drape them over the tire and connect them at the bottom. Fit the chains in the driveway before you ever need to use them so that you know how tight to adjust the back and the front without having to reset them once they are on. Maybe even mark the correct links so that months later you do not have to try to remember. Keep tensioners with the chains. A couple of bungies will do the trick if that is all you have but the actual tire chain tensioners are nice. Parachute cord is better than nothing for slack chains. If you have chains that fit ideally, tensioners are not as important. But I feel better using them even when I have perfectly fitting chains if the fender clearance is tight. Never had to chain up a 100, but all the earlier rigs, I can be chained at both ends and on the go in 5 minutes.
If I only have one pair of chains, I prefer to chain the front if the challenge is a long upgrade and the back if I am trying to maintain control on a long down slope. Not really an issue either way except when you are operating at and maybe beyond the limits anyway. Chains on all four are my preference and my default mode (I don't consider the winter gear load out complete with only one pair of chains).
Keep the speed down. It is easier on the chains, you are less likely to slap a fender if you have a loose chain, and... if it nasty enough to use chains on the highway... why are you going fast anyway?
Mark...