Not sure which fiber you have. They make special tools, most people that terminate fiber have a bunch of specialized tools already. I assume you know that you can't just cut the fiber with a wire cutter?
Now people that do this all the time I have seen use scissors or utility knives to strip them but it takes a lot of skill I suspect.
If you have what looks like a small almost spring that many times you can deform by pull on it to stretch it out and then carefully cut it with a normal wire cutter. There is also a tool that looks like a tiny pipe cutter that will score it. I have never done this, the fiber guys won't let me play with their tools and I just buy preterminated fiber for my own use.