I mean, look, it's nerve wracking. But do you want to know how to make it through the hiring process without embarrassing yourself? It's totally possible. These people were willing to share some of their criteria. One Reddit user wanted to know:
If someone shows up late for an interview with no excuse and no effort made to let me know they were running behind I tell them I am no longer interested in interviewing them.
Same thing for being interviewed. I've withdrawn applications and left appointments after being kept waiting with no good reason or apology.