I would like to ask a few questions - I hope it is ok to do so in this thread James.

Before I ask PP questions, I have a field question that relates to high dynamic range scenes, like the one here.
Roman mentioned above that for best results, expose accurately for the sky, then expose accurately for the foreground and blend the two exposures. In order to avoid camera movement, my process is to use the camera's auto bracketing capability to take three shots, one over exposed, one accurate and one under exposed. I usually set to F8 or F11 and use aperature priority, and confirm I get both ends of the histogram within range between the three shots. This does not, however, accurately expose for either - just gets it all in the histogram.

How do you prevent movement when you are exposing once for sky and once for foreground? In the past I have used the camera's spot meter to get both exposures, then manually changed the exposure between the two shots. Each time I did this I got camera movement from changing the setting. Maybe it is just that my tripod is too light, or is there a trick to do this?

I seem to fumble around trying to get a gradated ND filter to work right, so woujld prefer to do so in PP.

Is there something I am missing?