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I found Andy's video a good place to start, but also read lots of material.
One thing in the video - on two occasions he shows an image in which he says he is adjusting the Primary Mirror tilt with the collimating screws, but his fingers are on the smaller mirror lock screws (unless there is something very different about Orion OTAs). Also, I suggest that screwdriver is connected to your hand - use a big rubberband or something. In this way, you should not drop it onto the primary, even with OTA towards horizontal.
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