There is as many different ways as painters. Metallics I like to paint together, solids it doesn't matter. How many extra hands you have assembling painted parts does.
Edit/I'll expand a bit
Come up with a method to get around the cab and maintain a wet edge and stick to it for every coat.
My method would be something like drivers side roof and half way down front and rear pillars, then passenger side roof and pillars, rear cab around to to drivers fender, back to passenger cab corner up to the passenger fender, back to drivers fender up over across the hood and down the pass fender. I'm not long armed where I can get the roof side to side in a sweep.
Watch overlaps in areas like the mirror area, where you've hit the door, the pillar, the fender, and the hood. Another reason I go side to side, it give's a few minutes flash to those areas. Also I paint in a crossdraft where overspray moves forward. Read or ask for the tech sheets on the paint you're using, tons of info there. Use the right temp activators and reducers for the environment. Patience on flash times. Maybe more info then you needed.
Oh, and learn how to do the Curly Shuffle getting around dragging a hose! lol
Just my way and there is a thousand others.