How to Pick, Cut, as well as Bend Sheet Metal
https://wiki-triod.win/index.php/10_Easy_Ways_to_Cut_Steel_Fast--_The_Family_Members_Handyman
If you're using compound snips, open and shut the jaws totally with each stroke to optimize the size of the cut. If you have actually got a great deal of straight cutting to do, buy tin snips like the one shown