If you have a jigsaw.. I know that would work pretty much the best unless u got a dremel..
Id just go to ur local hardware store ask someone who looks fairly intelligent and say hey j00 have metal cutting blades for a router..

and if hes smart he will say
Yes we do there this way..
or..
No Sir, Im sorry theres no such thing..
or if hes dumb..
Daarr... uh.. metal? oh yeah.. oh.. this way... daar.. my name is phil..
im 20 years old.. daaar.. did you want blue spray paint or black?
but yeah.. u get the drift