Um, its not hard, although they say that the lines are just an “indication” read they are inaccurate.
I use the angle cube, basically I put the blade in the vice, zero the cube, put one of the paddles on the rod and lean that on the blade in the vice, then stick the angle cube on that, it stays in place as it has magnets on it, take a reading, then I move it either in or out until it reads 20 degrees, I then tighten that in to lock it in place and do the same for the other side.
Works fast easy and accurate.
Once it’s all locked in I retighten everything and away I go.
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