I love watching a kid who will try something they are not sure about because they are not afraid of "getting it wrong" even if they do. There is a balance between my child being teachable and me trying to "over teach him" so that he get's it right. Spilling milk a few times is a better teacher than me doing it for him or correcting him again every time he spills.
One day, he said "mom I'll learn faster if I try".Yep.The best and hardest thing I trained myself to do when he would spill, or whatever mistake he was learning from, was to not react at all. I would just say "oh do you need a towel? " If needed I helped out a few times when he was little always making sure he could see it was no big deal.