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Hi Peter,
I think that you need to do the pick off prism adjustment whilst using a fairly evenly illuminated main chip. So setup like doing flats. Then just wind in the pick off prism until you start to see a shadow on the main CCD. You should now have the POP in the FOV of the scope. Now await darkness, find a nice piece of sky with plenty of stars, anywhere in the milky way or LMC will do fine, focus the main scope. Start taking guider shots, 3 seconds should be heaps to find something, though if your focus is way off then you may need to up this to see the out of focus star (which scope BTW?), then simply focus with the focus knob. I have a piece of duck tape to hold focus rather than use the Allen key screw to lock focus as I find that the focus changes if I use the screw.
HTH
Cheers
Stuart
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