I thought you came across well and the nerves seemed to disappear pretty much straight away.. after you mentioned you might be nervous :) IMHO, I would drop this initial bit about saying you might be nervous, everyone accepts that this happens and before you know it, you are halfway through the talk.

Consistently remembered to repeat the question so others could here what was being asked.. so that’s good. Firm answers when being questioned about something as well.

You will be fine. Hope you enjoy it. :)