I've been at it for about 3 yrs. now, with no mishaps (except almost puncturing my thumb with a decapping/resizing die). In a former life I was a dental technician, and as such learned daily safety and awareness (open flame, torches, 1800 degree ovens, surgical blades, etc.). I have my 10 rules posted right over my bench, and every so often take a moment to re-read them.
The other night I was tired enough to neglect to visually check my charges when the cases were in the loading block; I dismantled all the bullet-seated rounds, and just to be sure, dumped all the charged cases back into the bottle and started over.
It's not the "experts" I have to be careful of—it's me.