Getting to the venue early so you don’t have to rush
Doing tech and sound rehearsal well before your start time
Walking around the stage so your body feels safe in the room
Sitting in the audience so you have a physical sense of what they will see
Eating early enough so you won’t be hungry, but not right before your talk
Talking to some people in the audience before you start (if it suits you), so it’s no longer made up of strangers (friends are less likely to try to eat you).