Lay a 2-by-4 stud across two sawhorses and measure out the required wall stud length using a measuring tape. Mark a reference point on the stud at the desired length.
Scribe a line across the 2-by-4’s surface using a T-square and the pencil. Place the T-square precisely at the marked reference point to ensure an accurate line is drawn.
Cut the 2-by-4 along the pencil line with a wood-cutting saw.
Repeat Steps 1, 2 and 3 on the remaining 2-by-4s.
Align all three 2-by-4s together and secure them using a C-clamp at each end.
Fasten the corner studs together by driving 16d nails at approximately 12- to 16-inch intervals on each side.
Put the assembled corner studs into position.
Check the corner stud’s 90 degree alignment on each side using a level. Place the level vertically along the stud surface. A helper may be of assistance supporting the stud assembly.
Secure the corner stud by driving nails diagonally through the stud into the upper and lower sill plate. Be sure the stud maintains a 90 degree alignment.