All at the same time is fine and efficient.
Do it with a dry crank and bearings. Place one strip on each journal with the engine flipped upside down. Make sure all bearing shells are properly and fully seated in caps and blocks (and they will crush into place anyway). Just torque all the main caps down (I like to do it in 2-3 steps of increasing torque, like 25, 50, then final ft-lbs), pull them back off, and read it. (Not stupid questions...)
