Remove everything you possibly can from your garage(that isn't getting painted).Hose down your ceiling,walls and floor(I usually do this a couple of times)Keep your floors wet while painting(This is huge!)Have a door opened a crack so some of the overspray in the air will have a place to escape.Don't use any heaters or fans where there will be heavy fumes(unless you like explosions)Always hit whatever it is you are going to paint with a blow gun and tac rag at the same time(Don't use cheap tac rags)Do this right before you are going to spray.And the giggest thing is remain calm and if something does go wrong, think about the best solution before you dive in to fix it.
For example..a run in the first coat or two of clear(or surfacer) ..wipe it off with gloves and just feather it out with your fingers.As long as it's getting more coats it will be much easier to cut out than a big run.I know it sounds crazy and it scared me the first time I saw it, but it is so much easier to fix.
Also, make sure your compressor is up to the task and that you have an excellent water filtration setup.The last thing you want to see is countless hours of prep work go down the drain when fish eyes start popping up from moisture in the line.Always run a dessicant dispossible filter at your gun.Don't use the cheap paper filters.You will have no idea when they need to be replaced until it is TOO LATE. The dessicants change color when they are used up.GOOD LUCK and remember, the best way to learn is to just do it.