Saw with a slow steady up and down rhythm using the entire length of the blade. This will allow you to saw faster and more accurately. Short choppy strokes result in uneven sawing and will prematurely wear out that section of the blade, causing it to break. On the downward stroke, a natural forward movement provides sufficient pressure on the blade. Too little pressure allows the teeth to simply scrape the metal, which is ineffective. An excess of forward or downward pressure will cause the blade to break.
Release the forward pressure on the upward return stroke. It only repositions the blade for the next downward cutting stroke. Dragging the teeth on the up stroke can cause the blade to misshape, and the teeth to wear unevenly.