I referred to my calendar on my computer as a quick, easy way to check the days for each month. In Windows, you can double click the time on your desktop, and Mac users who are running OSX can go to their "Widgets" and view a calendar as well. Simply go to the month you're designing and ensure that your numbers and days in your layouts match up. Once the first month is done, it simply becomes a matter of selecting all of the elements on the page, then copying that entire page and pasting it onto a new page. On the new page, edit in a new photo, change the days to their correct position and other information as necessary.