I prepared all the hearts, and 'sticks' as normal applique pieces. I use Floriani ( bought it here: Hergarden, Beverwijk , it is a water soluble stabilizer) and fold and glue the seam allowances to the back. I placed them on the pattern in the book to glue them temporarily together, the hearts on the 'sticks'.
Have a nice Weekend,
note: The Floriani stabilizer and some coffee and/or tea dye will disappear after washing when it is finished.