Just like "Skymortar" stated, it is a lot of feel and practice. I use a Cambell Hausfield HVLP gun. Just the type the buy at HD or Lowes. I practiced with my gun on a cardboard box and Lqr thinner or rubbing alcohol. It shows the spray pattern but no mess to clean up and it cleans the gun for you! Depends on the kind of paint you are spraying too. I use striclty auto base coat/ clear coat. I spray full fan pattern at about 35-40 psi on the regulator. When spraying base coat, never try to get a shiny wet look. Only go for a good coverage and color clarity. Paint is expensive, but practice with different reductions. Thinner is easier to run, but also goes on much smoother when it is just right. A good paint store will usaully reduce the paint for you to the optimum rate. Two part Catalyst clear and primers are very good and are very durable, but deadly to spray without protection. You get it in your lungs...then it sets like epoxy and can essentially suffocate you. So invest in good protection. Blue 3M vinyl tape works the best for masking, as it leaves a very clean line and will contour easily.

Those are some basics...good luck and have fun!
Brandon