As a general rule, short Swiss connections are normally perfectly fine so you shouldn’t have a problem.
Check out this map of Zurich station - https://plans.trafimage.ch/zuerich-hb?lang=en&layer=zurich_innenplan&x=683159.61&y=248087.52&z=17.
As per ralderton above platform 34 is below ground, and we can see from the map (click “-1” to see the underground level) that it’s to the right hand side of the station as your train arrives in from Lucerne on platform 10.
Just get off the train, don’t get distracted by shops, coffee places, shiny things, etc . . . and head downstairs and you’ll be fine.