Try down loading a template from the internet and use that to mark out the profile on your micro sim and cut to size. I did it this way, outlined the size on the sim, used a stanley knife to scribe the surface to double check size and then used a sharp pair of scissors to cut. I used a nail file to smooth the edges and fitted it no problem. If you have a friend with a nano sim use that to check the size and perhaps check if the thickness is the same before cutting just incase.