Like the whole thing - get a tissue, hold it themselves, blow until their nose is clear, and wipe. My LO is 3.5 and his teachers at school have been wanting him to blow his nose completely independently. He's good at wiping when it's just a little runny and will blow when I hold the tissue, but he doesn't do it on his own yet when his nose is stuffier. When could your LO blow their own nose totally on their own when it was stuffy?