You can easily insert a page number field in the footer of your document. You can also add a page count to the footer, for example, in the form "Page 9 of 12"
To Insert a Page Number
Choose Insert - Header and Footer - Footer and select the page style that you want to add the footer to.
Choose Insert - Field - Page Number.
If you want, you can align the page number field as you would text.
To Additionally Add a Page Count
Click in front of the page number field, type Page and enter a space; click after the field, enter a space and then type of and enter another space.
Choose Insert - Field - Page Count.