Most people never become auto-didacts. Most auto-didacts still benefit from formal training because above average gross performance can mask subtle mistakes until the mistake becomes root cause for a significant error.
Under significant pressure (like a well-written dramatic fiction, but almost never IRL), most doctors will be willing to perform a procedure without formal training, but under normal conditions, they know it is not worth the additional risk.
Most people never become auto-didacts. Most auto-didacts still benefit from formal training because above average gross performance can mask subtle mistakes until the mistake becomes root cause for a significant error.
Under significant pressure (like a well-written dramatic fiction, but almost never IRL), most doctors will be willing to perform a procedure without formal training, but under normal conditions, they know it is not worth the additional risk.