I think I can do Khechari Mudra.

I've never done yoga before and don't know much about it, so my apologies if this comes across as uneducated or insensitive. I can turn my tongue around and stick it quite easily into my nasal passage, to the point that I can touch my septum and leave it there. I came across a video saying that it's an advanced yoga technique, which is pretty cool. What are the implications/risks/benefits of such a practice, and how do I do it correctly?