Take one of the candles and light it up. Take a burning candle, be careful! The height/distance will determine the intensity.
Now sit on the chair/stool and drip a small piece of hot wax on the inside of your hand, adjust the distance between the candle and hand until you can bear the feeling.
If it's too hot take it off and cool it with water from the bowl. If it's way too hot cool it with the wet towel.