Maybe I'm looking at the wrong one (have a link?) but the instructions aren't much, or easily comprehended.

Find a place your house where there is no breeze but plenty of light. Keep the vacuum cleaner close by. Using a food scale, place a container or bag of down on the scale and measure by subtraction. Once the bag is completely stuffed and you are satisfied with the looks of the quilt, pin and sew up the remaining side.
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Life should not be a journey to the grave with the intent of arriving safely in a well preserved body, but to skid in broadside, thoroughly used up, worn out, and loudly proclaiming Wow! What a Ride!