Transitioning second baby into room with sibling

I have 2 kiddos the oldest is 2 and sleeps in her own room in her crib. My youngest is 10 months and is currently sleeping in our room in his own crib. My 10 month old still wakes up 2-3 times a night mostly for a diaper change and then to breastfeed.

We have a 2 bedroom apartment and I really want to move my 10 month old out of our room into my daughter’s room. I think moving him will help with his sleep but I don’t want him to wake his older sister.

Wanted to know how old your youngest was when you moved then into the room with their sibling. How did the transition go and do you have any tips? I know the kids will get used to the new norm but I’m dreading the first couple of nights.