The interview process is very easy, it's online, at your own pace. I had two tries for every question. You get prep time for the interview questions, and then you record your response. After you submit, though, there's no going back.

Laid back, be polite and professional. Make sure to dress appropriately. Uniform is jeans and a polo, consider something similar. Overall not a huge deal, but you do need to be engaged and have information about the company.