up till about 10 years ago i did all my moving/digging in the spring. problem is, it's usually a muddy mess most springs here in ohio. i was in a situation where i had to move a crown to make room for another plant one fall. everything went fine the next year. i think most hop farmers are pretty burned out once harvest is over and just want to put things to bed for the year. their big time for cultivating is in the spring so that's why most of the rhizomes are available at that time. the big advantage of transplanting in the fall is that you have time all summer to prepare an area without all the cold muddy weather, also, the soil is warm at this time (compared to spring) which allows the roots to get a foothold until the soil freezes. usually, things take right off the following spring.
being that it's just a yearling, you won't have a hard time getting most of the roots. don't sweat it if you lop a few off. just dig out about a foot or two from the center of the crown and lightly loosen the soil. you'll be able to see any rhizomes that have formed over the coarse of the year which you can trim off and use to establish new plants. if you don't have a place for them yet, just dig a trench a few inches deep and cover them over with a good layer of soil/compost/manure. next spring when it's time to plant, stick a shovel in the ground and dig 'em up!