Hey ESP47 I can give you my 2 cents on painting been doing it for many years and hope I'm not boring you but here goes. Best to paint the car in sections take the doors off fenders and so on and paint one piece at a time so the over spray is at a minimum this will take more time but better in the long run. The worst thing you can do in a shop without a paint booth is clean it and blow all the dust out just before you paint. Best to clean everything and wait at least a day so the dust settles then wet the floor down and make sure you the painter is clean of dust mostly like if you have a dog don't get around it so it's hair is all over you before you paint. Keep everyone out of the shop as you paint and make sure you have good lighting.