Regarding the size of the completed quilt: well, that's a good question... It depends on how big you cut the triangles and lay out the completed hexagons. It will be less than you think because there are lots of seams. I'm guessing that it will be a largish throw, about 60X60, but it is really variable. If you get 5 yards, you will probably have about a yard left over you can use for borders or a piece you can add to the backing. You can cut the triangles any size, but I think a good size is under 4", like 3.5 or 3.75. Just make sure you use a 60 degree ruler to cut equilateral triagles (measure the same on all 3 sides)