Khecari Mudra

I read about this and thought I would see how close I could get, not expecting to be able to get very far. Within several days I am able to get the tip of my tongue into the hypopharynx and I suspect if I wanted it wouldn't take me much more effort to achieve full Khechari.

This is supposed to take years, although I have read of people who have been able to do it spontaneously from a young age, so maybe I am just lucky.

Does anyone have any experience of this? I dare not go any further, particularly after my experience after a first super-O/Kundalini. There seems to be widely varying advice online ranging from it's totally safe don't worry, to only do it after years of preparation with an experienced teacher or you will do serious damage.