Actions that are emotionally scary but physically simple, I can do more easily than most. I just decide to do it, then turn my brain off and do it on autopilot. So, if I'm scared of applying to something, I will prepare the application while carefully not thinking about what I am going to do with it, and upload it. Then before I click the submit button, I turn off my brain so that I am not thinking about what the click means, and click it automatically. Usually then I have an explosion of panic, but it is short-lived most of the time. If I have to face heights without safety restraints, or catch a wasp, or deal with something really gross, or handle a dead/wounded creature, I do the same thing.
The only thing is that the more complex the action is, the less possible it is for me to turn off my brain and use autopilot. I can't do this for a conversation (which is the most scary thing for me to face, especially one that is related to job or money), or for something that takes multiple steps. If I didn't already have a cv prepared and hadn't written dozens of cover letters lately I wouldn't have been able to trick myself into editing them for this job that I really want. If I had to start from scratch I would have had to face that I was doing the actions specifically for this job, and it would have frozen me.
I suppose it's a kind of disassociation. I turn off my decision-making and consequence-considering capabilities. It's almost like being super drunk for a very short time. I wonder if I learned this from disassociating when I was younger, or if it's a thing anyone can do.