The above linked article shows tips on getting students interested in nonfiction work. Some of it really just applies to students, but a lot of it can be used by anyone who wants to get into reading nonfiction.
One of the best pieces of advice is to encourage discussion. I do this with bookclubs, so I know that it helps me to get into the books.
I also pick topics that interest me or that I know nothing about. I am big on believing that you should learn something new, constantly. Nonfiction is a great way to do this.
Nonfiction isn’t boring. There are so many parts to it, including history and memoir. Pick up something you are interested in and go for it!