How do you integrate new people in a team that already exists? Or should we rather ask: how do we make new people feel "at home" in a house that already has other people (and furniture, pictures, lamps in the right place?).

Our brain gets used (too much and too quickly) to what it already knows, so any necessary change may, at certain times, seem impossible to make, a Herculean effort, like the myth of Sisyphus.