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As far as lining up the second night, you can do it the way Paul mentioned if you dont have a lot of guide stars in the field of view that look the same... Taking a screenshot of the guider window might help in that regard.
What I do is open one of the images from the previous night in CCDSoft or Maxim, then take a new exposure.. Using the "blink" function, you can have the software blink between the image from the previous night and the current image. this way you can line it all up very precisely.. to the point of having all the stars within a few pixels from night to night... Clearly, this is less important with a very wide field of view, but with a narrow imaging setup like Paul's RC, it is pivotal..
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