Mark the placement of your heart on the inside of your patterned paper with dots. Make lines 1/4 inch inside the dots and cut with a sharp utility knife. Centre the heart in the opening and sew from the right side, catching the border of the heart in the stitching. You could try a decorative stitch.
Fold both papers in half, and coat the cardstock with glue stick, then place the papers together, making the edges even. Flatten under a book until dry. Voila! A cut little card!
Janie