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As there is only one NPP adjustment possible with the R1, it is easy to set up, and shouldn't take more than ten minutes or so. See http://www.johnhpanos.com/epcalib.htm. I hope you appreciate that the R1 is not ideal for shooting full 360x180 spherical panoramas, given that you cannot rotate the camera up and down to shoot the zenith and nadir while maintaining the NPP position. You can still get good results outdoors at least by making compensating adjustments of the tripod position and using the zenith/nadir adapter.
Many beginners don't get good stitching despite the panohead being set up perfectly adequately. It's impossible to say where your problems lie without seeing some evidence. Can you make available a set of camera images so that they can be investigated? Jpeg copies (half size would be ok for convenience if you prefer) uploaded somewhere - e.g. a free file sharing site like http://ge.tt/.
The R1 being a single row head is fine for 360x180 when used with a fisheye lens that has a 180 degree vertical fov when mounted on your camera. The Samyang 8mm is a fullframe fisheye with a 180 degree diagonal fov. (It's really a 9mm fullframe fisheye lens). It's possible to achieve a 180 degree vertical fov by mounting the camera rotated to bring the diagonal of the frame more-or-less vertical. A large angle of tilt upwards is also required, which leaves a large awkwardly shaped hole at the nadir to be filled. Try that by all means.