I think this is great advice! In 2016 I got bucked off hard the first time I tried to trot my 3yo WB. I got back on that horse 1-2 times and walked a few steps with a friend at her head, but never really “rode” her again. Fast forward a couple years and I have another WB baby to start (didn’t help that it was another chestnut mare, and all the other horses I’ve started have been stock breeds or Arabian). I was very in my head about how to deal with it, second-guessing all my preparatory ground work, etc. I took a weekend and audited a Buck Brannaman colt starting clinic and it made all the difference. Seeing lots of people of different abilities deal with backing a colt with much less prep work than I’d done helped a lot (as well as gleaning some of Buck’s methods). After that, I was able to go home and back my filly within the next few weeks, and with some ground help, got past those first trot steps where my last horse launched me.
Even if you don’t feel ready to go to the barn(haven’t read the thread to the end, sorry), you might try watching some things on YouTube - I’m sure there are plenty of tutorials on how to groom a horse, pick up feet, or whatever you can think of, then work up to being around it in person?