I had a buddy that painted cars in his garage all the time. He laid plastic on the walls and floors. Make sure you clean the heck out of the place. Use a good vacuum if you have one. He had a ceiling fan he'd turn on and he ran a high powered fan at the garage door. He'd shut the door all the way to the fan then hang sheets on the exposed part. If you have windows open them if you have screens. let us know how it goes.