Before you start slicing away with that saw. What you really need is a micro razor saw, not just a hobby razor saw. Big difference between the two.
A standard razor saw has too wide of a kerf. The width of the saws cut.
Here's what you need:
or you can chuck the blade in a #1 hobby knife handle.
This unit is from UMM-USA which is also sold by Sprue Brothers, I used to stock them but I am out.