Welcome. It's a beautiful quilt. My first pieced quilt was a king size double Irish chain, machine quilted. I love your idea of hearts in the white area. JoAnn stores carry a border template for chained hearts that would look really nice in your solid areas. SITD would be great around your diamonds. As long as you are using templates FMQ will not be that difficult. Just be sure to get your rhythm down on a practice sandwich each time you start quilting. You CAN do it!