If, however, you need to attract some attention or are participating in a motorsport that would benefit from you making a scene.
These steps are for a removable body panel but they work the same for anywhere on the car, it's just a little more comfortable to be painting indoors.
2" Masking or painters tape
X-Acto Knife (new blades, watch your little piggies)
Spray paint (I used Montana, quality paint, quality tips...less swearing)
Oil Based Sharpie Paint Markers
Step 1: Masking the Area
Cover the area you intend to work on with a large amount of masking tape. It gives you a surface to draw on (especially if the actual surface is a dark colour), it also acts as a stencil once you start to paint.
The iced coffee is optional but recommended.