Have a glass of water at the ready. It always helps to soothe my nerves and if I get stuck on answering a question, taking a sip gives me time to think things through. It’s also practical because if you’re doing most of the talking you’ll end up with a dry mouth and no one wants to croak during an interview. All this applies for both video call interviews or on site, in which case ask for a glass of water before you start the interview.
I heard it’s pretty common for lemmy users to have accounts across multiple instances. I have a couple as well “just in case” but the Beehaw community is pretty good and I’m just on it all the time and have barely ventured out on my other accounts.
We’ll see what the future holds for federation but as long as your chosen instance has high quality and active…activity then you should be good.