1) They can use Autoland if the aircraft is so equipped at any time. However, if the airport is operating to CAT I conditions then the crew have to be aware that the antenna sensitive areas do not have the requisite protection and as such should be ready to disengage and fly manually should it be required below 200ft.
2) Autoland is exactly as it says - the autopilot will land the aircraft, retard the throttles, autobrake and bring the aircraft to a complete stop on the runway if necessary. All the crew have to do is taxy the aircraft to the terminal.