window install

Hello all, Zero experience with metal work. Every video I have watched so far suggest using jigsaw for cutting out the opening. Has anyone used electric metal shears before? Will that work? TiA Gary

I'm looking to add a slider or vented window to the passenger side on the sliding door. Is this a good idea? Someone alerted me to the ease at which a person might be able to break the slider/vented portion of the window and slide their hand right in to open the door. Has anyone heard of this...