Not really if you've played any wind instrument, being a flutist it should be familiar. I own a 12 hole alto which can play a little more than an octave. You can get double and triples. With a triple it has pretty much the range of a flute.
The only trouble I'm having is modulating my breath since I'm use to my french horn. Now I'm inspired to go pick my ocarina back up and relearn everything. I have a terrible habit of putting it down for a while. I haven't really pick up my french horn in a while either, hmm.