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Not sure what camera you used - was it a DSLR?
Collimation issues and focus issues aside the best technique in my opnion to sharpen up an image is the Ken Crawford approach or something very similar. He has a tutorial on multiplle deconvolution.
But, as with any image processing, processing is always easiest with excellent data and no amount of processing should be considered a substitute for excellent data. So the basics done well sets up the excellent image.
Dark skies, exact collimation, accurate polar alignment, good autoguiding with low PE, accurate focus, cold and clean camera with a good chip and of course good optics.
Greg.
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