Good luck! I hope this is the one for you but if it doesn't feel "right" don't hesitate to walk away. On the cage thing... I rehomed Timber in June of this year. I let him keep the old, small cage because I thought he would be more comfortable. Now I wonder if that was a mistake, because he has no interest in the "palace" and is still residing in the dump-worthy cage. Others with experience can chime in, but I'm wondering if you wouldn't be better off transporting him in a carrier then putting him right in the new cage. Since he will be a bit traumatized anyway with the move, maybe it is better to do it all at once? Chime in here people
As for getting him settled, I'm no expert there either but I would say no raised voices, no jerky movements to startle him etc. Just sit in a chair by his cage and read something to him. It will depend on how shy he is, and how he behaves when you get him home. They are all different, and his reaction to you and the new house may be totally unexpected, one way or the other.