I couldn't help laughing when I read your post, I am just the same and I have not even got my puppy yet. Reading all you can, makes you really wonder how is it possible to get it right. Will you be able to raise a healthy, well groomed and well behaved puppy when so many have trouble. It's only cos we care that we are troubled. Pita is still so young, I'm sure in know time at all you will feel better about this, and we must both learn not to worry about things that haven't even happened yet. When your pup learns that you come home every time there, things will look up.
Good Luck!