wow, that is a crappy story for sure...
I`ve painted a car in a garage once and made a booth from foil. At least that will prevent dust from the ceiling falling onto the car. it`s also very important to put on your masking tape and paper as straight as possible. Any folds will trap dust. I think your biggest challenge will be evenly spraying the colorcoat. that is very important since the clear will work like a magnifying glass, especially with the metallic colors.
Remember most flaws will polish out, like a bit of dust and runners, but make sure you won`t get any mosquitos in your booth, they make a huge mess
and don`t be affraid to get some paint on the surface, a runner will buff out but you won`t get any shine when there is not enough paint on it.
no experienced members from your area who can come over and help you?