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Ah, thanks. Useful to know. Clamp & straight edge guide still useful I guess?
Even if it goes wrong make it clear that you think it's a bad idea before starting and you always have the trusty I TOLD YOU SO to fall back on.
Good call. I think a muted told you so, from behind a closed door, in a different building, in another city, in a far away land, might be safest if it goes wrong despite prior warnings.
You'll be most likely to be successful with the handsaw. As a bow saw would be too rough and a jigsaw blade will be prone to wandering caused by blade deflection in knotty wood like that.
Mark the line and keep blowing away the saw dust so that you can see it. You want to focus on keeping the saw blade, your wrist, elbow and shoulder in line at all times as this produces the best cutting stroke. Remember to let the blade do the work - don't force it and you'll be fine.
Even if it goes wrong make it clear that you think it's a bad idea before starting and you always have the trusty I TOLD YOU SO to fall back on.