That's wonderful other mummy! Transitioning will be hard. Mine was the same, the nanny had been with him since birth practically. We didn't do any transition days. We went straight in to full time! The first week was tough. Mostly because I wanted to make sure he was happy and doubted if I was doing everything I could to make him comfortable. Finally I just stopped pushed him and he came around on his own. He's one of my best now! So well behaved and polite and he helps with the little ones. I started mine at 2.5 as well.

All the best! Prepare for a few days of seperation anxiety, but it will pass quickly at that age.