Plastic sheathing and masking tape was not available at the end of the painting project for whatever reason, I have no idea, but you have a Paint Brush that if not cared for will eventually dry up. Last solution that works well, is to take a sopping wet rag, wrapping the Paint Brush up like that burrito you missed wrapping up earlier. This will buy you some time until either you use the paint brush again, or you can properly clean it.
You'll need a large compressor, not just the typical 20 gallon variety most of us have. This is a 60 gallon, vertical compressor with typically a 5+ hp motor. Then you'll need a decent paint gun (possibly 2; one for primer and one for color) which again is an expense. Then there's the question of where you'll paint the car. Renting a paint booth is best, but can be expensive and hard to find. You can always seal up your garage or shoot out in the wetted down driveway, but you'll inevitably get dirt and moisture into the paint.
STENCILING. You may want designs on the walls, or perhaps even on floors and ceilings, in some of the rooms or hallway. You may buy or make your own stencils, which should be on heavy paper, stencil board, plastic, or metal. Avoid stencils made of lightweight paper which will get soaked when touched by wet paint. Your paint dealer will suggest the best paint for you to use, as it will depend a great deal on the surface over which you want to put the stenciled designs. Generally a heavy paint is used, so that it will not spread under the stencil while you are applying it.
Another popular color wheel called the Munsell color wheel, is slightly more involved. Instead of 6 basic colors, the Munsell wheel consists of ten colors: red, yellow-red, yellow, yellow-green, green, blue-green, blue, blue-violet, red-violet and violet.
Gloss - These paints have a high sheen level and are usually used on woodwork.
A large whitewash brush is best for applying the wash. One should not attempt to brush out the coating, as in applying oil paint, but simply spread the whitewash on as evenly and quickly as possible.
Satinwood or semi-gloss - These paints are commonly used on woodwork, such as skirting boards. This sheen level is between eggshell and gloss.