dd2 has just clicked with the going for a poo thing and it has taken months for her to get to this stage but its very early days and she still wets herself occaisionally too. She started nursery and the school have made it clear they will NOT be changing a child who has an accident in fact they will call you and you have to do it.
fgs sake she has only just turned 3 and its so early days. I was made to feel like crap on her first day when I took her in, they questioned why she wasn't quite toilet trained 
So far she hasn't had an accident but she probably will, I just think its ridiculous to expect all 3 years olds to be toilet trained or even 4 year olds come to that