If your careful don't touch car unless well rested you can paint whole car then assemble and not get any chips scratches. But it is very stressful, slow, and high risk but it can be done. Benefit is zero dust or over spray on anything cause car is stripped for entire paint. With partial assembly then paint dust and maybe some over spray can get on stuff. Pros/cons.
I guess i could also have the guards removed when i install the engine and engine bay wiring so not leaning on fenders etc Ill defiantly paint the underside first so can get all the running gear in. As thats dont trust them around paint haha