Totally off topic, but you should look up the power poses TED talk. It really has helped me seem more confident and capable during phone interviews, as silly as it seems. If you don't have time to watch the talk, basically our body language influences our stress hormones as much as our stress influences our body language. So if you pose yourself in "powerful" positions (open, relaxed, taking up a lot of space), it can help you seem more charismatic and confident to others later on due to the physiological changes posing like that caused. It literally lowers cortisol levels and raises testosterone levels.