Can it be successfull

Can I change a 2 year old sleeping arrangements and be successful?? She’s always slept in her crib but now we have a new baby on the way the best thing for everyone (space wise) was to have my 2 yr old and 7 yr old share a full size bed. Crib will be moved to my room and used on new baby (very limited on space trying our best to make things work, this baby was a big surprises) My7 yr was in a twin size bed she’ll have no problem sharing she’s excited but my LO I hope she does ok!

Any tips or ideas to make it easier or anyone’s success story!! Please share