Transitioning Away From Swaddle

Hi. My daughter should be rolling over soon and I want to switch her to a sleep sack at that time. Can you just make the switch or do some babies need a gradual transition?

She still tends to windmill her arms a lot as she's falling asleep and it keeps her awake longer. I'm afraid we'll be in for some rough nights getting her to sleep / stay asleep during the transition. It might be inevitable, but just wondering if anyone has any experience with this. Thanks.