The first time I was supposed to preach, I ended up having a massive panic attack and having to stay home on the couch. (!)
What I learned over time was that, as much as I dislike being the centre of attention, and as much as it's been a long hard slog to become a confident public speaker, as long as the focus in my preaching is on the congregation - what do they need to hear today, and how can I get that across with love for them? - then I can do it and even enjoy it.
Start with love for your congregation and that will give you a good foundation.