The tool of choice is a hacksaw with 24-32 teeth per inch. If you're lousy at straight cuts you can use a pair of hose clamps on either side to make a guide on a fairly straight section. On curves use the hose clamp on the good side only as a safety so you don't accidentally cut too short.
Use a half mill file to clean up the ends and round the outer edge off a bit for safety. If your cut is really bad use a mill bastard (fairly coarse file) to get close to the line then finish with a half mill file.
Tubing cutters may be OK in on straight sections, but the rollers can't negotiate the inside of a curve, so they're probably unsuited to the task.
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