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If you are going to use the polar scope, get an inclinometer and compass and you should be within 1/2 degree to start with.
I don't know how accurate or easy the EQ6 polar scope is to use but even the best ones are limited by the faintness of Sigma Octans (if they sight on it).
If they don't use Sigma then they are not going to be very accurate.
At 1/2 deg polar misalignment and 30sec exposures you shouldn't see field rotation and you could probably get usable data with up to 100mm focal length lenses.
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