Difficult and intimidating but not too bad if you google what questions they could ask and have around 10 STAR situations practiced and rehearsed. Try to sit up straight, speak confidently. Don't use too broad of situations, they may ask for more specific situations about YOU not just the company you're at.

Pretty short and expected questions. I had 4 interviewers and ended with a HR meeting. It lasted 2 hours total and they are really fast to respond back. Everyone was friendly and wants to get to understand how you work as an individual and in a team environment.