Rehearse, rehearse, rehearse
That is, had worried about nerves throughout. In reality he was really good at presenting, but couldn’t finally shift the worry to one side. After the 3rd rehearsal, which went really well, he said. “I’m really looking forward to this.”
If you suffer from nerves, or worry about nerves, do the work.
Be well prepared, and then rehearse enough times to feel confident.
It really is that easy.