I haven't worked with sandstone before, but I've worked with several types of other stone. All I've had to do is score the stone where I want it to break, elevate the waste portion (and support the rest really well) and then give the waste a good whack.
You can score the stone with either a masonry blade for a circular saw or a masons chisel. I usually use the chisel. Whatever you do, I would suggest starting on a small piece first to get your technique right and make sure it's going to work. Be carefull and take your time while you work, you usually only get one chance at a good break.
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From the day of his birth Gilgamesh was called by name.
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