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The only thing I would add here is setting for colour correction.. if you are in heavily polluted area, that is.
Use "Per channels background calibration" (in stacking step1), this will keep the original colour balance of the target.
If you leave "RGB background cal", it will change the colour balance of the resulting image such that the background is gray, and in my case this is not so at all (in Melbourne we have a very strong orange background glow).
This problem can be removed later - I do it with Canon's DPP, basically it is about setting the individual colour channel black treshold, while not chaniging the gamma (too much) which results in "natural" color balance of the final image.
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