ok, design you sticker and or decal 1 up and save as an EPS/PDF and done. I never suggest or accept someone's file that has done the nesting/stepping for me.
You don't know the size of equipment, material or lamination that your printer has so don't make their job harder than it needs to be. Anyone that plays on the big stage of decal printing has all of the nesting automated so there's no need for you to mess it up for them.