The one that emerges is offering words before a crowd. My internship while at seminary was at a large congregation that worshiped hundreds at multiple services on a Sunday, and I had to help lead worship every week and preach once a month.
The difference for me was that, when I preached, I never tried to speak without a manuscript. I knew what I wanted to say and had the words in front of me. And I had a pulpit to stand behind, though I did eventually leave it every once in a while.
I had no desire to stand before hundreds of people with a sermon insufficiently memorized. I never wanted to put that kind of pressure on myself– even if, for some, this would make the sermon more authentic and personal.
Other than that, I still have fears to conquer.