I googled for a while and didn't find an answer so i'll ask here; if I am to make (lets say a simple box, that would have 3 sides of it textured exactly the same.)

Would I do that by just placing all 3 sides on top of eachother? And then in photoshop I would paint on top of one I would be painting on all 3 of them? Does that work? I have no other ideas of how to do it, i'm new to UV's and texturing in general.