I got my job when I was younger and didn't have any commitments/kids so it wasn't so much of a risk, although it was still a 1yr contract, which then got made permanent.
With a 6 month contract it's obviously a risk, but there is the possibility it might get extended or take on a couple permanently (we've just lost a couple of our permanent team members).
When I applied for the job I didn't have a degree, but I had several years experience doing live sound at gigs and had worked on student radio. So the required experience varies.
Basically part of the interview is a practical test in a studio, where they get you to show your skills in action. If you can demonstrate competence, then you stand a good chance.
We have some people who's background is more in recording/editing rather than live, but because they did ok in the practical test, they got the job.
Media jobs are tough to get at the moment and it is tough to get into the BBC, but once you're in, then it's easier to move around.
