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I guess I am lucky. I have my house plans and the coords and angles of the boundaries are marked on it. From this and a bit of high school trigonometry I was able to place a north/south string line right through the centre of my polar mount. Precision less than an arc minute, accuracy about 10 arc minutes!
If you use the sun and a plumb bob don't forget to check the actual time of the meridian pass for your particular location and if you are at a place where there is no shadow at noon make two passes one at 10 am and one at 2 pm and bisect the angle!
Barry
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