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Solar noon and a plumbline is your best Nth\Sth starting point. that gets you one pretty accurate alignment direction ( and is not subject to any error in magnetic Nth Pole measuring ).
Then I use my Android tablet with a free Inclinometer application to get pretty damn close to the right dec angle. Then refine by observation and drift alignment along the ecliptic line. Phones will work too but the tablet has a longer straight edge to be more accurate.
When I was setting up each night before the Ob I marked out three spots on the driveway where the tripod would sit. I also had a levelling strip made of a length of 2 x 4 shimmed to counter the drives slight downward slope. As long as I didn't move the mount head on the tripod I could carry it out, add the scope and be viewing within 15 minutes with reasonable accuracy.. The one meter long builders level was far more accurate in setting up the length of 2 x 4 than try to balance it on the mount head edges.
Heres a pic of my 'Driveway' setup. Might explain it better.
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