I just took a complete noob through the raid a few hours ago in about three hours, and the most important part for anybody new going in is to really try and be a quick learner and be able to follow directions. If you communicate with the people trying to walk you through what you do and don't understand about the mechanics, so you can get some more clarification, the better you and your teammates will do without people getting upset. Another tip is to also expect a little frustration from your teammates once in awhile, just be chill and acknowledge that you are trying your best to figure it out most people can handle it when someone is completely honest about what they do and don't know how to do and are willing to try and help you out. But like I said, at the end of the day the experienced players also don't want to waste a ton more time than it should take trying to teach new players,so the quicker you can learn the strategies on your own the better attitude your teammates will have towards you.