Assuming "experience of anatta" means abandoning the fetter of self-view (or [sakkāya-diṭṭhi](https://en.wikipedia.org/wiki/Fetter_(Buddhism)#Identity_view_(sakk%C4%81ya-di%E1%B9%AD%E1%B9%ADhi))), that and "conviction" (i.e. lack of doubt) sound like "stream-entry".

There's been lots written about stream-entry (or [sotāpanna](https://www.google.fr/search?q=sotapanna)).

Stream-entry is often (usually? always?) portrayed in suttas as being the result of a waking realization, a result of an experience or hearing a dhamma-talk -- one memorable though non-canonical example is [Gotami & the Mustard Seed](https://www.accesstoinsight.org/noncanon/comy/thiga-10-01-ao0.html).

I think that (etymologically at least), *sakkāya-diṭṭhi* is a wrong *view* about the true or real body -- i.e. it's a view that the [aggregates](https://en.wikipedia.org/wiki/Skandha) are self.

Note that a "view" is something established, reinforced, believed -- see also https://buddhism.stackexchange.com/q/9415/254 because the answers there explain the difference between (fixed) "identity view" and a more transient "conceit" -- the eradication of "conceits" should happen at the final stage of enlightenment.

More generally, though, I think the doctrine is that *any* or every view of self -- including for example "I exist" and "I don't exist" -- is confusing and the result of unwise attention. Maybe *that* is easy to verify (by inspection).