In this video, Mary and Marianne Fons shows how to cut pre-pieced 60 degree quilt triangles with strip sets.
To make the half quilt block, just lay out the pieces to get it organized. Its important that the triangle twosies make the prints all come together at the middle. Because the triangles are blended, you don’t really need a pin at all. But you might want to add a pin just so you’d know what side is right.