I live in Canada, so my experience may be different than yours.
I COULD NOT find a shop that was willing to take my car in and shoot it after I had done the bodywork.
It wasn't that my work was bad.... they would not even look at it.
Also.... I painted my shell in my garage. Built a tent out of vapor barrier, had ventilation, and a high quality organic solvent vapor mask.
I NEARLY DIED> DO NOT TAKE IT LIGHTLY
My diagnosis was chemical Pneumonia. Permanent damage done by VOC. I will never be the same and have an increased chance of developing cancer.
In the end, I paid a shop 10,000.00 to take my car down and paint it.