What's the easiest way for me to cut thin metal?
Hacksaw

Lots of work. BORING!



Oscillating multi-tool or Rotary tool

You're probably not cutting 1/8" steel with this, but it's useful for cutting very thin metal.




Jigsaw

A little more fun, but still a bit tedious. Make sure you use the proper blade.



Reciprocating saw

More fun, but you may have trouble keeping a straight line.



Angle grinder

Let the sparks fly!  Lots of fun, and it will allow you to plunge cut.



Torch

An Oxy-Acetylene, or Plasma torch will make short work of this job.



Punch press

Finish the job with the press of a button.



Lightsaber

Fast, but requires a bit of Force.



If you're using any of the saws, make sure you use cutting fluid to prevent the blade from overheating.