I agree with the comments above.
I have an X-Acto and will never regret purchasing it.Very handy tool especially with resin and for converting kits.I prefer to use a razor saw as much as possible to minimise the dust.
Verlinden ,as said above ,hardly ever provide instructions only ,and I have double checked my stockpile ,for multimedia kits. They are normally straight forward so they are not required.For larger kits try e-bay for a cheap motor tool(dremel etc)
Regards,
Simon.