But without it you would die. So being able to remain conversant and at ease with your topic and audience might also be considered good. Fear of the unknown is

But without it you would die. So being able to remain conversant and at ease with your topic and audience might also be considered good. Fear of the unknown is what'll get you. I find being nervous helpful in that my habits when nervous are repetitively re-checking my preparations, which usually lead me to finding that key item(s) I might miss if I were more cavalier.