Maintenance staff, including those for the pitch, safety systems and many other new features which aren't transferable as they aren't part of Goodison Park.
As you mentioned, there will be a lot of appointment for hospitality, concierge and many other aspects which will be new positions and this may take time.
Everton are planning on 'getting the keys' so to speak in December, but it isn't likely to be mid-January that we are playing competitive matches there.
And that's before the constant changes Everton are asking for... they're putting pressure on timeframes.