This instruction is for a regular, bamboo incense stick with one end bare about 5 or 6 centimeters.
Take any string, cord or chain that hangs freely. ceiling fans work great, but know that the ashes are going to be falling. I set the fan on low to help circulate the aroma.
Take the string (cord etc) between finger and thumb, palm facing away, thumb on the far side, like you're showing the 'OK' sign with your elbow up, level with your shoulder. Twist the string by turning your palm down and toward you (elbow comes down).
You should have a little loop with the the end of the string crossing over on the near side.
Now, place the end of the incense stick behind the string, directly above the loop, pull it slightly forward and place it about 3 or 4 centimeters into the loop -going in from the side facing you. You might want to light it first.
Once you get the hang of it the stick will drop into the ashes below (I use a brass plate to catch them), but be careful using this technique outside, especially if the weather has been very dry.
This is an exercise in giving verbal directions. Please, tell me how I did.