[draigenia]

1. What is it that experiences anatta if there is no (intrinsic) self?

The fact is no self. Anatta were allways shown but we look over it. Vipassana will help us experiences anatta.

We could observe that the feeling of "I" was not shown all the time.
Someone may be found that the feeling of "I" be shown when we taught.
During we received information, not yet think, the comment was not yet arise. Anatta were showing.

IMO If the DO process was interupted and could not went thru the step of becoming. There was no self feeling.

2. Assuming all phenomenon are the result of causes, does the idea that this is the case also have a cause. In some sense I'm asking where the chain of causes began.

Ignorance was the begining of the chain of causes. We response something with the feeling that I do and need the result on the way that I respect or need to be.

If we create "I" then the kamma can effect to "I".
If no "I", kamma don't have the object to effect to.