The videos I've see for fun and done show that you do the piecing and quilting at the same time. If you want to do the 4 patch posies, you would already have the piecing done, and you would be just doing the quilting as you sewed the 3 layers together. Just make sure your posie squares are the same size as the batting and fabric template in the fun and done set. Then cut your batting with the template and the backing with the other template. Stack them together and following the fun and done directions and quilt together. After you get all the blocks done that way, join the blocks together the fun and done way.
As usual, I know what I'm trying to say, but I'm probably as clear as mud! lol