My cats had no trouble during delivery, so I wouldn't know much about that. She should be fine on her own, with your close watch on her & just pet her and try to keep her calm during delivery. Calming words to her. She will take the sacs off & bite the cords herself. Don't try to take matters into your own hands if everything's going fine. Leave it to her motherly instincts.
Just make sure you have the number of your local vet or emergency vet, should anything go wrong & you need advice or help.
Oh and the kittens should come out head-first.
Anything other than that, somebody else would have to advise you.
Since she's just sleeping, I'm not sure she will have them really soon. I don't know, though.
Wishing your cat a safe delivery!