One precaution: You can't paint with it in cold weather. The chemical reaction that transforms the water solution into a durable finish will not take place if the temperature is below 50°. (Conventional oil paints don't stick well in cold weather, either.)
Changing Colors. If you're keeping your Mustang the same color it is now then things stay pretty simple. Areas like the door jambs and inside of the trunk are probably still in good shape since they aren't exposed to the weather and you won't have to worry about repainting them. But if you're changing colors these extra areas will cost you. Be sure the price quote you get from the paint shop includes these extra areas. If you wait until the day you pull up with your Mustang prepped for paint you could be surprised by this extra cost.
Take off the chrome molding around both the windshield and rear window. You can pick up a special tool at your local Mustang shop or by mail order that removes these quickly without scratching paint. Of course your paint is probably not in great shape at the moment, so a large flat screw driver will also do the trick. For some classic cars it makes sense to even remove the windshield, but classic Mustangs have chrome molding that will help cover any slight overspray.
Suppose it rains while you're working? Vinyl paint dries fast - as quickly as 10 to 30 minutes - and will withstand a shower after that time. It takes another 12 hours to "cure," by then forming an exceptionally tough, long-lasting film that stands up well against weather, sun, salt air and factory smoke.
You can tell when the bucket of paint is getting low when the airless starts pumping really loud and doesn't stop. Simply tip the nearly empty bucket of paint, at an angle so that the mesh filter is covered and wait for the airless to catch up and stop pumping. Sometimes it's just easier to just to replace the bucket of paint with the new one and when that starts going down, pour the excess from the old bucket into the new one.
In symbolism you do need to look for the hidden meaning, and it's absolutely pointless in pop art, op art, art nouveau or hyperrealism. Each style and genre sets forth its requirements, so brush up on the movement the artist belongs to before you proceed.
For stippling you need a special brush; get one that is flat, and has short, stiff bristles.