I wouldn't get too worries just yet mate. It's late March now, and the first aircraft doesn't arrive until September...
For start up, they need about 280 crew. Plenty of time between now and then - and that's just for the first three aircraft. There's four more on top of those, plus 6 'options' with Boeing.
I don't know if they've even started general Cabin Crew recruitment yet. I'm only aware of Flight Manager/Cabin Leader assessment days...but I could be proven wrong!