I didn’t do anything specific - I just sat there and stared at the flame. I blew it out myself after about 5 minutes because I had to leave (I performed the dedication ritual in a construction-warehouse in the evening with my friend who was working there, since it was the most private place for us as teenagers). I didn't wait until the candle burned out or anything.
There’s no need to overthink or obsess over this. Your dedication is valid.
Most people don’t feel or notice much, as it largely depends on how open and strong their soul is to begin with. So, don’t worry.