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Hi Theo!
Have a magnet handy for keeping the screws in one place.
The area where you'll be removing the primary...make sure it's clean, no pets, kids,etc! All tools are clean.
Finding the primary mirror's centre? While the mirror is out, place a sheet of clean greaseproof or tracing paper on a level surface. Place the mirror shiney side up on the paper and trace the bottom with a felt pen. Remove the mirror and fold the paper into a quadrant. Nip (tiny) the corner of the fold with a pair of scissors, unfold the paper as flat and as cleanly as you can and you should have a squarish hole on the middle of the circle. Carefully place the paper on the mirror and align the circle to the mirror. Using a whiteboard marker make a dot through the squarish hole in the centre of the circle onto the miror. Remove the paper and you have a centre dot on the mirror in which to place a collimation stick-on circle. Clean the whiteboard dot off with a cotton bud dampened with some isopropyl alcohol and gently dab, not wipe, rotate the cotton bud on each dab.
Cheers!
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