The things you are most afraid off or nervous about are often the things that you really should do. The only reason you are anxious about it is because it really matters to you, so you care more about doing it right.
If you only do those things that you are fully comfortable with you aren’t doing anything that really matters to you. You aren’t progressing either since you aren’t challenging yourself if you just strive for comfort.
“Life begins at the end of your comfort zone.” -Neale Donald Walsch
Nerves aren’t a bad thing, just don’t let them hold you back. If you feel nervous about something see it as a sign that you are doing the right thing. Courage is not the absence of fear but going through despite being afraid. So conquer those nerves and be awesome!