You've already sewn it this way and will be able to finish with help you've seen here. Cute fabrics!
But, if you choose to make another Card Trick quilt, take a look at this method and see if that will work better for you. I received many positive responses for the clarity and ease of doing it this way.
http://www.quiltingboard.com/tutoria...n-t137717.html
Jan in VA