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assbutt94 - I pre-align the centre of my illuminated right-angle-finder exactly with the centre of the telescope (that in itself is difficult at 4000mm focal length). I focus the OTA on a star and wait until the ISS is starting to make its pass and is visible. With the clutches released on the EQ mount (and the mount suitably "polar aligned" parallel to the ISS's path, I aim my finder at the ISS and try to keep it as close as possible in the finder cross-hairs whilst tracking it across the sky. The large sensor size / lots of megapixels of the 183MC gets me plenty of images that I extract from the resultant 50-ish gigabyte video using PIPP.
I hope that explains it reasonably well :-)
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