Generally speaking PCBs are easy to cut with simple hand tools. If it is short area you need to cut I would use side cutters to snip it off and then file or sand the edge smooth. If it is a long area I would use a utility knife and score both sides a few times and then snap it off and then finish it by filing or sanding. If it is long area I would add at least a cm along that edge to allow it to be snapped off in one piece. I would not use a saw as most saw blades have teeth and they tend to grab the copper layer and tear it off which basically ruins the board. If you want a perfect edge then using a file to remove all the material would be the best (and slowest). Whichever method you choose just try and cut off less than you want to remove and remove the rest with a file or sandpaper to make sure you do not cut off too much.
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