if you think "confidence" in your ability is the defining factor - you don't drive on public highways
I load in an area with no distractions and still set rounds aside to pull apart because i did not like the way the wad felt going in or didn't like the crimp.
If something does interrupt me- that round gets rejected
I weigh sample charges often - even if I am sure its the same bushing I used last time. and the left over powder goes back in the can so that i don;t have to remember or trust having labeled the MEC bottle
I shoot reloads in doubles so that I can look down the tubes,
and this stuff still makes me nervous
BTW - having shot flintlocks for years in friendly competitions - every one of the few incidents I saw were due to the loader being distracted in the process.