The truth is that there is no single way to do a Speech from the Throne. Sometimes they're entirely written by the Prime Minister's Office. Other times they're entirely written by the public service.
You start with framing the main thematics. Then you also try to define some of the signature items that will be the takeaways for Canadians, because really what you're doing with a good Speech from the Throne is that you're trying to set out the future agenda for Canadians. You're basically saying to Canadians, “Here are the things that I want you to judge us by as a government.” That's really the intent of it.
One of the interesting things about a Speech from the Throne is that the first two paragraphs are written by the Governor General, and then the government takes over. She or he has two or maybe three paragraphs. It depends on the Governor General. However, there is this difference between different parts of the Speech from the Throne that is kind of interesting.