I've had the Shapton Pros and Choseras cut by a professional here in Taiwan, and I am also working with someone in the US who is cutting glass stones.
One thing's for certain - if you plan on cutting the stones by yourself with less than industrial equipment (or even with it!) be prepared for a lot of work and possible chipping, cracking or outright shattering. The upside to the risk is a custom stone that fits your needs.:)