I learned it in Sunday School with hand motions. What I remember is:

(Holding index finger up)
This little Gospel light of mine
I'm gonna (going to?) let it shine (2 lines 3 times)
Let it shine, all the time, let it shine.

Hide it under a bushel? NO! ... etc.
(Cup other hand over finger, pull off at NO!)

Don't you try to (blowing sound) out!..etc.
(Shake finger, then blow on finger at appropriate point)

All around the neighborhood... etc.
(Hold up index finger & move in circular manner)