I did it a few years ago Mike, and the only thing you have to watch out for is to make sure you cut on either side of where those little plugs sit inside the handlebars that the stock bar-ends screw into, and which of course if you cut on the inside those little plugs and towards the middle of the handlebars, you won't be able to use the stock bar-ends anymore.
(...but seein' as how you said you already have aftermarket grips on your bike, this probably won't matter anyway)
