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Do your collimation at daytime on a solid mount (or cushion etc.). If out of collimation in a horizontal direction - no real problem, your eyes can adjust for that. If out of collimation vertically, that is a problem and will cause eyestrain.
Yes, get AOE's guide notes. Difficult to describe how to do it - but best on a straight edge - eg. the sharp line of a gutter, perhaps a taut powerline. Normally a little tweak of one prism collimation screw brings them into good conditional collimation. If you have to adjust the intraocular distance (IOD) for someone else, the collimation may go out again. You need an expert to collimate them so they are fully collimated regardless of IOD.
Checking under the stars - line up on a bright star. Pull your head back until you are seeing two images of the star, one in each eye. Then move your head towards the eyepieces and allow the images to come together to merge. You want to see them approaching each other at the same vertical level. If one image is significantly above the other, you will either see double stars, or you will twist your eyeballs to bring the images together - but your eyes will hurt after a while.
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