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If you get one of the standard skywatcher cheshire collminators they have a 45deg cutout, you can shine your red light and do it in the dark of night if your worried about collmination and in anycase is actually better than using just daylight! it highlights the central spot and the cheshire spot...
My best advice to save your hair and pain, is go and get somebody to show you only suffer the pian of learning yourself when there is no other option.
With my standard Skywatcher cheshire i can obtain accurate collmination for 20min exposures for astrophotography! so im happy presently. and i made a laser collminator for ease of getting the secondary angle. but in anycase you can use a cheshire to do that once you know how.!
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