We often forget that children don't automatically understand how to do some self-care tasks (blow their nose, comb their hair, wash their hands) that adults assume are easy. Remember: children really WANT to be able to do these things well & take care of themselves.
This wonderful extract from Dr. Montessori's book The Secret of Childhood, details the deep sense of personal dignity in young children:
“One day I decided to give the children a slightly humorous lesson on how to blow their noses. Since after I had shown them different ways to use a handkerchief, I ended by indicating how it could be done as unobtrusively as possible. I took out my handkerchief in such a way that they could hardly see it and blew my nose as softly as I could. The children watched me in rapt attention, but failed to laugh. I wondered why, but I had hardly finished my demonstration when they broke out into applause that resembled a long repressed ovation in a theatre. I had never heard such tiny hands make so much noise, and I had no idea that such small children would applaud so enthusiastically. It then occurred to me that I had perhaps touched a sensitive spot in their little social world.
No one really teaches them how they should blow their noses. When I tried to do so, they felt compensated for past humiliations, and their applause indicated that I had not only treated them with justice but had enabled them to get a new standing in society. Long experience has taught me that this is a proper interpretation of the incident. I have come to appreciate the fact that children have a deep sense of personal dignity.”