My daughter 5wcf has been doing them regularly since 2.5 and the thing that helped her learn the technique the best are those party blowers, the ones that have the paper that is curled up and it shoots straight out when they blow. We have her try to keep them blown out straight as long as possible, which is how the pft is done. We let her "get us" with them by getting face-to-face with her, she loves it.