I'd like to see a mini tut on how you guys actually add HDRI to your scenes. I've yet to see a "this is what you do" tut. I'm probably being real dense, but having never used it before, I'm not sure how to do it. 
Do you create a super large sphere and apply a 'spherical' HDRI image to it?
My eternal thanks to anyone who will tell me how to do it.
:) Ang