[verga]

You go to confession and tell the priest you're excommunicarted latae sentenciae and explain the circumstances. Either he has the authority to lift it under the stated circumstances, or he doesn't. If he doesn't, he can't give you absolution but he can send you to the designated priest who can.

In every diocese, I believe, not just the bishop but priests designated by the bishop can lift an excommunication.

I ain't no canonist, so if there's more to be said, I hope somebody will jump in and tell it better than I did.

Depending on the circumstances The person may be (NOTE: may be) required to make a public refutation of their previous position.

This would be in the case of notorious sinners or politicians (But I repeat myself), or other public advocates.

[BlackElk]

I am hoping that you are right and also that the Church may consider REQUIRING, as a condition of lifting the excommunication, such refutation of previous public positions as publicly as the sins were publicized by the sinner.