Use a stud finder and slide it slowly across the wall
Tap the wall and listen for a solid, less hollow sound
Look for electrical outlets, which are often attached to studs
Check for baseboards, trim, or nail patterns that may reveal stud locations
Measure 16 inches from a known stud center to find the next one
Use a small finishing nail or thin drill bit to confirm the stud location
Mark the stud center with pencil once found