Measure a strand of leather cord that is twice the length of the lanyard's desired length. Cut this cord using scissors. Cut another cord of the same exact length.
Lie the strands of leather next to each other. Place a lanyard clip over the center of the strand of leather.
Hold the lanyard so that all of the strings fall towards the ground. Label these strings as string 1, string 2, string 3, and string 4. String 1 should be the string on the far left and string 4 should be the string on the far right.
Pull string 4 around the back of the strings, under string 2 and string 3. Pull it around, over string 2.
Pull string 1 under string 2 and string 4. Pull it around, over string 4.
Pull these strings taught and "re-label" the strings. Repeat the braiding process.
Tie a tight overhand knot to secure your lanyard.