Before starting straight away, we did a few short sessions, if I remember rightly,
session 1 - 1 hour (with me there)
session 2 - I dropped him after 9.30, they put him to sleep at the usual time for him and I picked him up before lunch.
session 3 - dropped at 9.30, slept, had lunch there and I picked him up.
I think the first 2 consecutive days he had there all day, I arranged that he was in, but I did not go into work so at home.
The first few weeks when I collected him, I will never forget that he didn't 'talk' to me, get a reaction, no eyecontact etc. As if he was punishing me for leaving. He may have been a little unhappy when we dropped him, but he was fine shortly after I left.
Alex