And if you're worried about the babies being mean like your trauma inducing fluffy from the past- make sure to start getting them used to your smell and touch early on. as soon as the mother leaves them in search for food you can give them a light cleaning and start this process. Hamsters will eat the their babes if you try this, rats mommies are way better at what they do.
Just be mindful of the momma, shell be kinda hormonal and might not act herself for a little bit during/after the pregnancy (ie she might try to bite you). She'll be back to her docile self soon after though.