I have never jacked up a tractor to put on chains. I looked for the video that was posted here on TBN but could not find it.
I tie a strong cord between the sides of the chain and hook that over the lugs on the tire then I just drive forward and let the tractor pull them on.
Found an older post with pictures
Mounting tire chains
The whole job, both wheels takes 10 minutes or less and that's getting off my tractor 4 times to make sure the chains on both wheels stay straight and that they are going on tight.