New Starts - Big School et al

This week marks the end of an era and the start of a new one.
PJ will have finished her first year with me - yes - a whole year since placement - and the end of her Nursery years - and the start of BIG SCHOOL.
School transition here we come!
I have mixed feelings - for her - how will she cope with yet another change - and how will she settle with big changes and challenges of going from a key worker ratio of 1 to 6 and into a class of 1 to 30 - and how will she progress or will she regress?
I have mixed feelings - for her teachers - how will they cope with her - how will they help her to settle, to reassure her and set good boundaries in place for her to feel secure and also to help her to rise to the challenge to learn and for her to learn well - how will they take on board all that has been said and written in preparation for her to transfer to big school about her background and complex needs and still see the vibrant and yet vulnerable child?
I have mixed feelings - how will I cope with losing her - a year at home with PJ has gone so fast and there is this sense that I am losing her, irrational I know, but it is there -how will I cope with going back to work as my adoption leave is coming to an end and I will be returning to work - how will I juggle our new and changing work life balance and still retain and maintain some fun and quality time at home with PJ and I together?
Anyone else have my rambling thoughts, worries and concerns with the start of going to big school or returning to work?