After 6 hours, I finally forced both phones to abort what they were doing and, before trying again, I used the enclosed mini tool to pop open the SIM card drawer and check it out since the iPhone 11 had hung on "activating you iPhone" step. The card only fits one way and so I put it back in and embarked on my second attempt -- this time I decided to not initiate the iPhone to iPhone transfer at the first presented opportunity as I had seen from the Google searches I had done that the the expected place to initiate the iPhone to iPhone process occurs later in the set up process. When I got to that second opportunity, I then started the iPhone to iPhone transfer and it completed within about 90 minutes. I will add that there can be some difficulties in subsequently pairing one's existing Apple Watch with one's new iPhone. I did first un-pair the watch from my old phone but it still wouldn't pair with the new iPhone -- after observing that the new iPhone was 'busy' downloading 70 or so apps from the app store, I decided to wait until the next day when that process step was complete. But the watch still wouldn't pair regardless of the method I used (auto/manual). Finally, I rebooted the iPhone 11 and then it finally paired with the auto method.