I did things, some of which were pretty useful or clever, but between telling me what to do, coaching me how to do it, reviewing what I did, and telling me what

I did things, some of which were pretty useful or clever, but between telling me what to do, coaching me how to do it, reviewing what I did, and telling me what to change, I probably cost more time than I saved the first few years of my career. I almost certainly took more time from my seniors than I saved them, and the juniors I've mentored have mostly done the same for me.