I have a hand held electric shear from Harbor Frt. It works great of flat metal but it can't handle the bends in corrugated. The backwards blade in a circular saw is much less frustrating although not pretty.

[Linked Image from harborfreight.com]

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.