I think I'm pretty good with Photoshop (I have CS5) for editing photos, but I'm still struggling with astrophotos - mostly because the ones I take are poor quality. I've discovered that to be able to get good results post-processing an astroimage you have to have a decent photo to start with - something with a decent histogram.
So maybe one of your tutorials could include a session taking astophotos with a DSLR. I happen to have a Canon 60D and my telescope is a 12" Meade LX200 GPS (equatorial mount). One would think I should get really good photos, eh? I'm also convinced that to even get a one minute exposure without star trails that I should be autoguiding. OK. So I have a Meade DSI-II Color camera for that, but my 80mm finder scope is f/10, and that doesn't make for a very wide field of view, and selecting a star for autoguiding in a near empty star field can be frustrating.