Cutting through that just stand on the sheet (on top of a piece of wood) and drill. Whatever corded drill you have.Take your time and lubricate. It isn't that hard to do. Just get a bit for ferrous metals. That bit from Lowes looks like it's more for thinner sheet metal not steel plate. And don't put it on hammer if it's a hammerdrill.
Quote me as saying I was misquoted.
Once you get rid of integrity the rest is a piece of cake.
The problem is you don't know what you don't know.
Here's to our wives and sweethearts - may they never meet.
If you agreed with me we'd both be right.