I wouldn't go as far as calling you a noob mate.
-Don't paint in the rain(or when theres moisture in the air)
-Don't open&close the shed door
^key rules.
Remember to do lighter coats then what you normally do with non-metallics.
light,fast and even coats are very important with metallics.same as can be said with pearls.the paint can tend to swirl&tel-sag(workshop nickname for metallic sag ) if you lay it on too wet, so be careful.
Wet the floor or atleast cover it if your worried about overspray.
Also because of the size of the car,i'd be inclined to raise it up on wood,bricks etc
And you should already no this: mix the paint in one go.
Ch0