to use the vacuum technique you move the blow hose to all the areas that you would like to fluff up,... that you can reach. if any of the cushions are loose you can put them in a lawn and leaf bag and blow air into the bag.if they are the type of cushions that don't really have a shape and they are not too large you can put them into the dryer on air with a clean tennis shoe. or a tennis ball.. that type of thing.
I have never tried the steam iron...I don't think i would want to place the iron directly on the fabric..but if you have the type of iron that has the steam shooter..held just above the fabric....I would try it, if it were mine ..let me know how it comes out if you try the steam.Good Luck Happy Thanks Giving
I forgot to share the foam details. The foam should be the dencist you can find in a sheet or shreaded foam in the bag ...they both could have the pounds on it like 50 lb or 80 lb. get the highest number you can. this technique can be done before thanks giving..it does not take a lot of time. Just open a seam in the back bottom of the cushion put the new oam in and tack it shut for now after thanks giving is over you can stitch it up to be strong.