Nice start- it's not the easiest bit of software to jump into. The background modelling tools in PI are really effective, and I'd have a look at using the Morphological transform tools to help your M22 a little. The histogram and curves tools are also useful, you can pretty much dispense with photoshop once you get the hang of the PI version.
There's quite a few video tutorials on the PI homepage, I found these absolutely invaluable just to learn the 'feel' of the interface.
Mind you, my family is planning an intervention shortly to drag me away from it!
Cheers,
Andrew.
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