I found this post very interesting and helpful.
It’s about presenting your work and making sure that you sell it.
Personally, I have never had problems with public speaking but there’s a difference between talking about something and trying to sell something. And I know that when it comes to persuasion, I’m still not an expert.
There is this one tip in the article that I particularly like: Get the client involved with the creative process. If they feel they have helped you in some way with the campaign, it’s not only your creative work, it’s theirs as well. And this increases the chance of them giving you the green light.