It's not a special skill; cutting guides aren't worth a pinch of shit. Better off eyeing up a strip of tape and cutting up to that.
I put a hose clamp around the steerer and cut against that.
A cut-off wheel on a Dremel gives you slightly better control than a hacksaw, too.
But at the end of the day, it only needs to be straight enough; the top of an ISP would be more critical
@Chaley started
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It's not a special skill; cutting guides aren't worth a pinch of shit. Better off eyeing up a strip of tape and cutting up to that.