FWIW, I used to cut my own mounts with one of those £50 hand cutters. However, the problems with getting the corners absolutely right was a major issue. I now use a small gallery to cut my mounts on their computer based cutter for £2.50 each and it's worth every penny in time saving and card wasted to get it right. Good luck with your mount cutting though! I hope you have more luck than I did with it.