Really chilled and open if you're confident and passionate enough in your craft to talk with like-minded individuals. Its always a good sign when the people you're talking to (and potentially going to work with) are as enthusiastic as you are about animation.

The interview is usually a test and interview on the same day, this is due to them wanting to see how you handle their rigs and software. This is also a good experience for you to understand their typical working day. At the beginning of the day you will be asked to clean up some motion capture facial animation of the game they are currently working on. It was about 4000 frames and you are expected to do at least 1000, as they expect you to do 2000 a day depending on the difficulty. You are given the run down of the rig for the first hour then left to work on it. They encourage you to ask as many questions as possible. The interview itself is more of an opportunity for you to present yourself and your work as they will have your CV and showreel up on screen. Your CV is just a conversation starter, I recommend you not waiting for them to ask you questions that you have prepared for. Talk about yourself and your passion.