This trade should include its own layout and field measuring in work scope. The coordination of any backing requirements should also be included in these measurements. If there are any sway bracing it should be included in steel and miscellaneous metals trades’s scope. The electrical wiring and hookup should be done by the electrician.
As far as scheduling, this trade installs only after the other trades mentioned here, therefore it is usually not a critical item, unless the very end of the entire project schedule is tight.