Firstly, assess how tight the drum skin is already.
STEP 1: Assessing the djembe skin's tightness
Put your thumb in the middle of the drum face and push down firmly.
How far can you push down?
1cm (0.4 inches) or less: MINOR DJEMBE TUNING
More than 1cm: MAJOR DJEMBE TUNING
The Djembe Drum
African Drumming Store