Hi again. You don't have to worry too much about your clothes and blankets. Just wash them well. I also wouldn't worry a lot about the furniture. Pets often bring the fleas up on the couches and beds when they lay on them, but I doubt there are too many fleas that are going to hop up there on their own.
Boric acid kills because of the way its shaped - tiny sharp edges. For the flea larva its like eating glass. It damages them internally. It can be irritating if you breathe in a lot of it, but wearing a dust mask while you sweep it in will help. If you managed to get some in your eyes it probably wouldn't feel too good, but rinsing them out should be enough. After you vacuum there won't be enough left on the surface of the carpet to cause any trouble.
I refer to it being non-toxic because it contains no insecticide. I don't think you are going to find an effective home flea control product that is less toxic.
As far as the reproduction problems go, I think that only applies if you eat a large quantity of it. Considering what it does to flea larva that eat it, I would be more worried about gastrointestinal problems than reproductive. Just avoid eating it

and I think you'll be fine.