The two most common ways of cutting pcb are:
1. use a guillotine
2.Score heavily with a sharp instrument and a straight edge. Place the scored area at the edge of a table, hold firmly to the table and sharply knock/bang the free end hanging over the edge. THIS WILL RESULT IN A CLEAN BREAK, NOT SHATTERED PIECES.
I have seen a few boards where people wanted fancy shapes so they used a bandsaw. Although it was a decent cut, the edges weren't very clean by comparison to the above methods, even after cleaning with a file.
Choice is yours