With a miter/circular saw. I'm physically unable to cut straight with handtools. Even if I use a square to make guide lines around the entire piece.
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I do this: https://www.youtube.com/watch?v=d7J6WpwQ5Rs
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I 3D-printed myself a magnet-equipped guide based on some posting on Instructables that I can no longer find. It has a provision for swapping out fences so that it can be oriented reliably at angles other than 90⁰. On the downside, it has to be clamped to the wood and is too small to work well on sheet goods.
See those yellow-plastic roofer's squares? the triangular ones?
https://www.stanleytools.com/products/hand-tools/measure-and-layout-tools/squares
Those things.
They line-up cuts beautifully.
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PS: I was unable to post my comment when I selected it was in English.
Somebody's got the server, or this community, mis-configured.
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