As per Alchemy
Remember darks should be taken at the same temp and exp time, so take them as frequently as time allows -every 4-5 shots maybe.
I (sometimes) do flats using the evening sky. I don't remove or change the camera orientation after taking the flats.
I don't trust anything "automatic" and would rather have some imput, so I would still do flats. It doesn't hurt to learn and practise this technique.
