Definitely don't try and force them through the wood - because the kerf is so thin and the teeth so hard you can snap teeth off if you do also applying weight/pressure to the blade makes your cut more likely to skew.
Think about body position and movement to keep cuts going straight, sometimes for best results you might want to clamp your wood in a different orientation to how you would with a western saw.
I have a set of 3 Gyokucho saws (Ryoba, Dozuki and Kataba) and they are brilliant - a cut made with the dozuki almost looks like its been planed the cut is so clean, the others aren't that far behind.
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