Since the OP used the phrase "for personal work" I will offer the following:

My local framing shop has a computerized mat cutter, and it is a joy to watch. However, I prefer "floating" mounts where the edges of the mat form a window for the print. Chatting with the owner, I mentioned this and he said that the computerized machine should be able to do it even better. I brought in an example, where the print was slightly off square but the mat and print edges were nonetheless parallel. The error was difficult to see, but would have been disturbing if the mat opening had been a clean rectangle. When I explained how to do it with a Dexter mat cutter, he just shook his head. Actually, I first learned the technique because I had so much trouble cutting down sheets of mat board to (sufficiently) perfect rectangles, an essential for mat cutters which measure in from the outside edges of the mat.(Of course, his computerized machine handles this effortlessly.)