Read blueprints or other specifications to determine methods of installation, work procedures, or material or tool requirements. Measure and mark surfaces to lay out work, according to blueprints or drawings, using tape measures, straightedges or squares, and marking devices. Fit and fasten wallboard or drywall into position on wood or metal frameworks, using glue, nails, or screws. Measure and cut openings in panels or tiles for electrical outlets, windows, vents, plumbing, or other fixtures, using keyhole saws or other cutting tools. Assemble or install metal framing or decorative trim for windows, doorways, or vents. Cut metal or wood framing and trim to size, using cutting tools. Inspect furrings, mechanical mountings, or masonry surfaces for plumbness and level, using spirit or water levels. Cut fixture or border tiles to size, using keyhole saws, and insert them into surrounding frameworks. Cut and screw together metal channels to make floor or ceiling frames, according to plans for the location of rooms or hallways. Hang drywall panels on metal frameworks of walls and ceilings in offices, schools, or other large buildings, using lifts or hoists to adjust panel heights when necessary. Trim rough edges from wallboard to maintain even joints, using knives. Suspend angle iron grids or channel irons from ceilings, using wire. Coordinate work with drywall finishers who cover the seams between drywall panels.