I found this you-tube
www.youtube.com/watch?v=H6t5OCuMloA It is from LearnHowToQuilt.com I made one with Y seams years ago and this looks familiar. It was time consuming but the it worked.
If you go to the website she has a lot of free tutorials on stuff. If you find the link for Quilting Classes and click on it and scroll down until you find Beginner quilts and click on the "Star Sampler Quilt" click on that and stars 22 & 23 are the Videos for this star.