Hi Dennis
I have a Celestron C8 and a CG5 AS-GT mount (although I now have the C8 on an EQ6 mount instead - see later).
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How difficult is it to assemble and pull down?
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Not difficult at all - counterweights, counterweight bar, mount, tripod, OTA
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What power supply is required?
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12v at a minimum of 2 amps - jump starter packs are suitable, although for sustained long-term use I would recommend a deep-cycle battery
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Can the finder scope be fitted with a 90 degree prism instead of the straight view?
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Yes - comes with a 6 x 30 - I would recommend replacing that with a wider field of view finderscope and/or laser pointer/red dot finder. The initial accuracy of the controller can be well off the mark until at least 2 alignment stars and 2 calibration stars are included.
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ability to track accurately and its stability
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Now we have moved into a completely different area.
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My main interest is imaging
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For visual use, the CG5 mount is quite capable. Imaging - DSLR or CCD? Guidescope with autoguiding? Adding a wide field guidescope to the C8 with all the associated cameras and dew stuff starts to overload the CG5 and it is not as good as a mount such as the EQ6 for imaging.
Please ask if you have any further questions.
Cheers