What kind of cutters do you have ? It depends on what the wire is made of, too, but...
I've had trouble using aviation sheers for some things (to the point where I'd have to put my entire body-weight into it and they'd get dented) and have had to resort to bolt cutters.
Bolt cutters are a bit pricey, but nice to have around since they're very efficient when it comes to how they cut. You can get cheap ones for around $20, but I have never used them and cannot say what quality they are. You might be able to borrow some.