Have that diagram (the FQ with the squares drawn on it) next to your fat quarter. Cut out starting with number 1 (those are the biggest). I would do biggest to smallest myself, but you can follow the numbered blocks.
What might be easier for you is to redraw that diagram onto a piece of paper the same size as your fat quarter, then you can lay it on top of your fabric and get a better idea of how to cut it. You need to do the same cuts to 13 FQs.