Just cut the card manualy. I wouldnt trust a simcard cutter since different simcard types have the chip in different sizes.
Get your ipad microsim, place it on the regular simcard so that it completely covers the metal chip. Trace an outline around the microsim so that you know where to cut it.
I cut my mirosim with a dremal and it was super easy, other people cut it without any issue using normal scissors.