Unswaddling

My little one is 3 and 1/2 months and her startle reflex is nearly gone, however, getting her to be a task! She now rolls from tummy to back very well, that’s why I am trying to get her use to not being swaddled. Our little girl is very active and likes to constantly move her arms. We use the Love to Dream 50/50 and have tried one arm at a time, but she doesn’t seem to get settled. When did you start unswaddling and do you have any tips?