For the first year I would not trim anything. Actually, my third year cascades got minimal trimming. Just near the bottom when they were crawling all over the place. I was pretty much just to busy/lazy to do anything with them.
Anyway, if'n I was you I'd harvest by hand and let the plant continue to collect sun and make roots grow. My 2nd and 3rd year plants got cut when I harvested. They were just too massive and loaded to make me want to pick them off the vine. I ended up cutting them into 3rds, each.
All of them grew to together at the top of the 16ft. pole, so there was a massive clump of hops. Some of them got little sun and were very light in color and smallish in size. Not sure if this is due to the 3 plants growing together or not, but next year I will be either putting up a pole for each plant, to affixing arms to the top of this pole and separating the bines a bit more.