I was hoping to be good cop - I am not. =)
Here it is about fail often and well. Fall and pick yourself up. She has never been in any danger but, we haven't padded our home or wrapped her in cotton wool. One thing that I have noticed is she repeats something I say to her when she feels she has done well, 'Good work.' She doesn't misuse it either as she knows when what she has done is worthy of the phrase and when it isn't. All in all, she is quite self sufficient for a 21 month baby.