Thanks, Jim; I hadn't considered it from the supreme rationality standpoint.
To my original question, I still wonder if anyone has further recommendations, though, if the Day came and one got no "fireworks."
Aaron Leitch (pretty well-known in the online Hermetic/Abramelin-discussing community) says in an essay of his that he did not
experience the extraordinary vision, etc. on the appointed day; he therefore simply proceeded on the following days to the Convocation of Evil Spirits as planned, trusting that his Angel was with him and would not let him go astray.
Then about a month later at an event when he was reading Tarot cards for people, the Spirit, as it were, moved him and from that night his relationship with his Angel has ever deepened and flourished.
That seems at variance from other accounts of attainment I've read, where everyone describes the final Day in the most exalted terms. But every HGA is different, so ...
So on the one hand, as someone planning to embark on this voyage, on the one hand I go, "Cripes. What will I do if it doesn't work? Start all over? Just keep going a few more weeks/months and hope?" ... but on the other hand, I think that if I had gotten that far and seemed
to be getting somewhere all along, it does feel like a "given" that I would be guided in how to proceed next.
Maybe I've answered my own question.