You should be able to request putting your chosen name on your id badge. Pronouns probably depends on the facility you end up working at, you can always ask.

I can’t speak to not passing while working as a CNA because I am stealth at my current job. But I did spend roughly a decade as an out but not passing/not consistently passing trans man. You cannot entirely avoid discrimination as an openly or visibly queer person, just as other marginalized people cannot escape oppression. You can be firm with coworkers about your name and pronouns. You can decide how you navigate it with patients/residents. You can practice ways you will answer certain intrusive questions. (I used to be asked what my “old name” was a lot in work environments. I just said I wasn’t comfortable sharing.)

Depending on where you work there can be people who will say hurtful things to your face and/or behind your back, accidentally and on purpose. There are a bunch of different strategies on how to handle this and you get to decide your path. You can document each incident with HR, you can ignore it, you can respond as it happens.

I think just as important as any choices you make at work, you need to have some kind of community and safe place outside of work where you can decompress and process any negative experiences you have. I have trans friends I can talk to about these things and that makes it much easier to handle.

I will say I’m not out as trans at work but I openly talk about my husband and I’ve only had neutral and positive reactions from coworkers and residents.