OK, I have all my squares sewn and the border attached and I'm ready to cut.

What's the easiest way to cut these using the tool.....rotary cutter, scissors??? It seems "awkward" to try to cut around the tool with my rotary cutter. Is there a trick I just haven't thought of? Do you just slice through borders and all? I'm having a problem cutting the left side of the tool. Does this make any sense??