This week, New York’s Juilliard School will send another several hundred young musicians, dancers, and actors out into the real world, armed with talent, a diploma, and some of the best training available anywhere on Earth. But pedigree doesn’t count for much in the hyper-competitive world of performing arts these days, and the reality is that, even for the cream of the crop, the road from Juilliard to a job can be a long, difficult one.