Similar points as above really.
I rationally look at the situation and decide if I can do it. Using the example above I can jump the table top so there's nothing except fear stopping me from doing the double.
Visualisation is important for me, if you can see yourself riding it that's a big step.
Back in my kayaking days I used to find peer pressure helped as did doing things quickly so I didn't have time to worry. I would literally scout, jump into my boat and push off as fast as possible, once you're in the thick of it fear isn't there.
There was an article, on here I think, where the guy talked about going on 2 rather than 3. By surprising himself he had less chance to bottle it.
The last approaches are reckless but did lead me to run some of the hardest stuff I did in a boat especially where I had no prior knowledge of how things might pan out (a small spillway in south Wales 😉 )
Rationalisation is the most sensible and leads to less of an underwear bill.