Um...
Shifting into a human form for the first time is partly a matter of concentration; most dragons first learn how to do it at around 1 [dragon years] old. It can be learned sooner if they are specifically taught in different ways. If they have a decent understanding of what humans are and are able to imagine a human that looks like they want to, then they should be able to shift.
"Umm... Well, I've never done this before." Itenii said nervously, trying to get away from the general mass of people. "I don't know if I can ever learn how to use the spores, they sound hard..." He muttered to himself