Print the pattern and cut it in half along the dotted line.
Find the center page of the book. You'll start marking on the right side. Slide the pattern in the book, about 70 number pages past center. Match up the top edge of the book pages with the horizontal line on the pattern. Match up the wide of the book pages with the first vertical line.
Use the pencil to make marks where the line of the heart meets the edge of the page (two marks on each page). Slide the pattern in to the second line and turn the page of the book. Mark this page in the same way. Repeat this process, sliding the pattern in one line each time you turn the page, until you get to the last line. Then go back to the center page, turn the book over, and repeat with the left half of the pattern.
Hold all of the marked pages. On the top of the book, measure in 3 inches from the edge of the pages and draw a line across all the marked pages. Repeat on the bottom of the book.
Open up to the center page. Line up the 3x5 card with the mark on the bottom of the pages and the lower mark on the side of the page.
Fold up the page using the 3x5 card as a guide and crease. Turn the page and repeat the process. When you get to the last marked page, repeat the process on the top of the pages.
The heart will begin to take shape. Repeat the process on the left half of the book.
Display the book standing up so the heart can be seen.