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 showing 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 was when he would spill, or whatever it was he was learning, was to not react at all. I would just say "oh do you need a towel? "....and help a few times when he was little.