I want to call around to print shops and see if they do A0 printing. The one time I called before they had no idea what I was talking about... Any tips?

I don't know enough to know how to explain it. Large format? Anything I should check? I guess making sure they print it to scale? That they can take the a0 file?

(I'm about ready to switch to projector sewing but the thought of calibrating every time/figuring out a spot to do it/trying to make sure my pattern is the right format there is giving me anxiety)

Thanks!