This highly depends on the team you are going to. My personal experience was very positive. The people who interviewed me were very relaxed, and that's how I felt during the interview myself. Mostly, I felt that the selection was based on cultural fit more than any technical skill. In the worst-case scenario, you would need to prove that you are comfortable with basic office skills, email, and the web. Part of the interview was conducted in English. Nothing to be afraid of.

P.S. - Even if you don't get it, your resume will be sent to different teams unless you did something stupid, which increases your chance to get invited again.

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