Laying out should include

determining the number of ceiling joists needed for a given job
placing ceiling joists on the top plate
marking openings, according to blueprints.

Process/Skill Questions:

Where are the details for ceiling framing found?
What are the typical layout dimensions for ceiling members?

NCCER Carpentry Standards

Level One, Module Seven (27112-13): Ceiling and Roof Framing

Module Seven (27112-13) provides an overview of ceiling and roof framing, including the components of ceiling and roof framing, the different types of roofs used in residential construction, and the use of trusses in basic roof framing. The methods for laying out rafters, erecting a gable roof, framing a basic gable end wall, and installing roof sheathing are introduced. It also provides instruction on how to estimate the amount of materials needed for a material takeoff for a roof.