I wonder if the visualization aspect of jumping out of a plan would also help my nerves. Maybe set a date and then watch YT videos for a few minutes a day on tandem jumping.
Put another way; you become comfortable with being uncomfortable. Believe it or not, you can actually enjoy those feelings.
For 2 out of the 3 people profiled, the OCD stemmed from a fear of something bad happening and that was their way to cope. For one specifically, her mother had a surgery gone wrong and almost died.
The therapy was to have a mock funeral for her mother, go to the hospital and watch her mother have blood drawn and essentially go through all of the motions of having her mother die so that she could process it.
By the end of the treatment (which seemed to be a little ad for only a few weeks) her symptoms were drastically reduced.