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I usually drill a very small hole into the middle of a film cannister lid, insert it into the eyepiece and make sure you can see all 3 (or 5) screws on the side of your primary mirror as you are looking through the small hole you've drilled. The hole only needs to be a few mms. If you can see all screws around the primary then your secondary is close enough. I then get a cheshire collimator and look through the small hole again. It is then a matter of adjusting the primary knobs behind the scope until the two round dots you are looking at through the cheshire match up.
That's going to get you close enough and much closer than a laser collimator IMHO. Clear skies.
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