Hey, I’m not non-binary but have a few friends at uni who are. In my experience, everyone within the LGBT+ society at uni pays attention to pronouns, but outside of that it’s a bit hit-and-miss. I don’t think my friends have received any negative comments from anyone, but people just assume their pronouns and sometimes continue to use she/he even when corrected (maybe genuinely forgetting, maybe not, idk).
In terms of lecturers - I guess personally I’d wait until you’ve met your lecturers, and then send the nice ones an email explaining your name and pronouns. Obviously I hope all your lecturers are nice, and I’d be really surprised if any were intentionally insulting, but some can be a bit thoughtless. Like my German lecturer who set a homework that literally said “men, write about your dream woman. Women, write about your dream man.” Which as a lesbian was uhhh an interesting assignment.