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No minimisation of steps is allowed.
You do that, and your images will lack that little something which will set them apart from everyone elses.
As mentioned in another thread, I stick by what I said about creating image libraries; darks -- how are you to account for the decay of the sensor over time, unless you create regular dark frames (which defeats the purpose) and flats -- this idea is preposterous.
For the high-end dedicated astro-CCDs, the creation of dark libraries may be a viable solution to saving time out in the field, but, for us DSLR users who take their astrophotography seriously, nothing beats the real deal of creating your darks immediately after the lights, and flats and their associated darks after that, or even before the lights.
As for the sequence of steps, what I've done in the past is the following:
1. lights;
2. darks;
3. flat lights;
4. flat darks
Regards,
Humayun
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