Paint Safety:
Many hobbyists want to paint their own cars/bikes etc. This isn't recommended unless you have some training, experience, and some good equipment. Paint manufacturers rarely mention any of the dangers and needed precautions for using their products. They simply want to sell you some paint. They DO put warnings on their product labels, but very few people take it seriously. We even see "professional" custom painters on TV shows, shooting base/clear urethanes - wearing only street clothes and a cartridge respirator! (delayed suicide).
You CAN learn to paint your own car, but it will require some basic training, and the means to acquire some proper equipment. If you're not willing to do that, you'd be ahead of the game to pay a trained and properly equipped professional to do it right.
DANGER!.....
Automotive paints contain a number of different chemicals. Some are known carcinogens. All of the health effects of exposure to these chemicals are not known, but some reported are: asthma and lung diseases, nerve disorders, circulatory problems, high blood pressure, dermatitis, cancers and enhancement of existing cancers, heart problems, liver problems, sinus problems, seizures, vision problems, headaches, hearing and ear problems, suffocation.... You get the picture. The effects are cumulative - they collect in the body over a period of time. They can be inhaled, absorbed through the skin, eardrums, and eyes. Automotive paint is classified as "hazardous material" ... always keep that in mind! While all of this sounds frightening, it really relates only to unprotected exposure to these materials. They can be used with relative safety under controlled conditions. This means a suitable air transfer booth, and personal protective gear - Tyvek paint suit, supplied-air full-face mask, hood for headcover, and nitrile gloves. The air supply must be NIOSH / OSHA "class D" breathable air.
A word to the "custom painter"....
Airbrush artists are often artists who put art on cars/bikes, but don't know much about automotive paint... they load up the airbrush with urethane basecoat and start painting... wearing just street clothes and a cartridge respirator - or no respirator at all... In a word: DON'T! ......get educated on the use and handling of these paint mediums BEFORE you start using them. As noted above, you need to adorn the right protective gear... It takes some getting used-to, but, in the long-run, you'll be glad you did.