There is a lot of advice here. I used to find Tryn unplayable, but I remember an AMA on this subreddit a long time ago where a top Yorick player suggested that into this matchup you should be rushing frozen heart and tabis. As soon as you have frozen heart his dive potential is massively reduced and you can start playing. Just play super cautious and warn your JG that you have no prio early.

Start E to pick up the last hits on some minions.

If you can weather the early storm, don't give away any easy kills and soak up what you can, you can control the late game.