Just posted this in another thread. This is the response I got in case anyone else was wondering from Lynn at GLH.
Treat them as 2nd year plants- but wait to do any trimming until you
get all the primaries running up the twine a good 6 to 8 feet. Leaving
the smaller bines a little longer can help "push" the primaries up by
supplying more energy to the forming root system. (You just want to
keep the base of the plants cleaned up so you don't create spidermite
havens.) The hybrids will probably push more than 3 or 4 primaries -
limit them to about 6-8 bines this season. If you train more than 3-4
on a string they tend to get so thick that bugs and mildews can become
an issue. I run two strings per hop plant the first year.
Lynn is supper helpful. I've sent probably 6 emails to him with a quick informative response every time.