Individual book page nodes can always be found on the default Content Management List.

Books, however, also have their own special Book Management List located at Admin menu > Content > Books.

This screen will display a list of the titles of all top-level book pages.

To look at the content of a book, click its respective edit order and titles link.

Once inside of a book, you'll see that the items appear in an outline form.

To move individual nodes, you can just grab the little handle of node and drag it to where you want it.

You can also change the title of a node from within here. Any changes made will cascade down into the page titles and the Book navigation links.

Once you're all done, click the Save book pages button.

Upon saving, you'll see that all changes you've made display throughout the automated navigation.