But what if the item you want is out

Look at the Copy information for this book.

Note that the Status of each item is Due: and that there is a due date.  This means that the item is checked out to another borrower.  However if you need this item, you can Reserve it, which means that when it is returned the item will be held for the next person on the reserve list, and that person will be contacted.  If no one has reserved the item, then it will be returned to the shelf.  To make a request click on the Reserve Next Available Copy button. 

What's the difference between Reserve Next Available Copy and Reserve This Copy?

Do this now