Danfoss HS3 valve leaking

Hi,

I've noticed the Danfoss HS3 valve on my Boilermate A-class SP is leaking and the actuator is making a clicking noise so I think that's going too. Is this a complicated job? In my head these are the steps:

1. Kill power.
2. Drain system. (Is this necessary?)
3. Unscrew old valve + actuator.
4. Replace with new vale + actuator.
5. Wire up new actuator.
6. Refill system by expansion tank.
7. Power on.

Does this sound right?

Sounds pretty good
Mike