We had to move DD1 into a big bed a little while ago to free up the cot for our new little one. We tried to get her excited about it by letting her pick out a bedspread for it (she chose Dora) and telling her what a big girl she is now for sleeping in a big bed. It was easier than we had expected although we did have a few nights that were a bit difficult. She moves around so much in her sleep so we got put bumpers on the sides to stop her falling out. She has been fine ever since and she loves showing off her big bed to all her friends. Good luck with it!