Moving twins from crib to toddler beds

Ashley
Alright so I have 10 month old twin ladies and in about 2 months I'm thinking about switching them to toddler beds in their own room. I have baby #4 on the way in November and would really prefer not to buy a third crib. 
I'm looking for advise and tips on how to make the transition as smooth as possible. They will be making 2 significant changes. They are currently in our room in separate cribs and will be moving into their own room into toddler beds(hopefully). 
Thank you in advance 😊