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After initial processing, I usually go into photoshop and duplicate a couple of layers, this will allow me to adjust different depths without stuffing the image up. On one layer I adjust colour balance and try and bring out more detail in the Neb, using colour balance and saturation, as well as curve adjustment and levels. Another layer is used to adjust background darkness via curve adjustments again and levels. and another one to smooth out noise by applying a median filter and put this layer at the bottom. All layers once you are happy with them can be divided into their own percentage of opaicancy like 25-25-25-25 to make up 100%. This works with some images, but not all, you have to be a bit selective what images you apply it to. Once flattening the image you can do final adjustments in brightness and contrast.
I have had up to 10 layers on one image and they turn out okay. If you can get hold of a book for Astrophotography in Photoshop or something like that, it will be a great help. Again it's up to the individual and the image to the way you process.
If your unsure on curves adjustment, go into You Tube and type in the search Photoshop curves, it has some pretty cool tutorials.
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