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Reducing images is a standard process and most professionals are practiced in it - but there is a lot more to observing than that.
You know how often I have been asked to observe a target by a professional only to have to tell them that the target isn't actually observable (and I don't mean just by me - I mean just not observable by anyone - except possibly a space telescope)? Observational experience covers the planning, there is the hardware knowledge - telescope and camera, knowledge of the limitations, the experience to know how long something needs to be observed for a given purpose, to know when you can start capturing it, how often it needs to be observed and so on. The ability to recognise a usable image and images that need to be tossed, the ability to recognise setup errors and quickly correct them.
Hope that clears up my definition of an 'observer'.
Cheers
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