Backyard paint booth

Another idea is to get just the FRAME of one of the "carports" - with the little tubing frame, pre-bent corners & connectors. The kind that comes with a silver tarp for a roof. (Sometimes if the wind was strong, you can get the corners/connectors from someone else after the wind tore it up... they act like large kites). If you do this outside, it will act like an oven when the sun heats it up.

Get a roll of visquine and a WHOLE bunch of spring clamps. Drape the visquine over the frame, use all the little spring slamps to seal it up. Put a couple of box fans in one end - blowing out. Use duct tape to tape in some A/C filters to the other end. Put your car on jackstands as high as possible. Wet down the floor, sto stop things bouncing up against the bottom of the rockers.
Use a TYVEK/paintsuit & good respirator - modern paints are nasty things.

Lots of Pre-cleano / wax degreaser (like mentioned before)...

Spray early in the AM and then let the car "bake" in the sun for a few hours. It gets VERY hot once the "greenhouse" effect begins.

49T&C