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If there's no autoblend, a simple trick can be to set the top layer you are trying to blend to 50% opacity and select 'difference' in the layering method. As soon as your stars line up, they'll go black, and reveal where else they are out of alignment (This will only occur if your photos have field rotation from poor polar alignment).
Once you've done this make a masking layer and selecting the brush tool, set the hardness to like 30% and slowly blend the two images together. I've personally struggled with getting proper panoramas even in CS5 simply because of vignetting and creates uneven gradients in the final image where you blend.
Good luck!
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