Happy to report that the ride went very well. Didn’t do more than WTC but I did not die and I actually felt much more competent than I normally do. Thank you all who provided supportive words and stories.
Unfortunately, am passing on the horse given health issues that were not disclosed at the outset and were serious enough (even given expectations of issues in a SM) that I can’t get over them for the price. My risk tolerance is just not that high.