I don't think anyone can top the answer given by this guy, you honestly could not give a better answer even if your life would depend on it -
https://www.youtube.com/watch?v=FqJcP64FEuY
as for any BA schemes, you don't have to quit your job, to apply to the scheme.. chances of getting in are small, you can quit your job if you actually get in. As captain Petter said - do it, but PLAN IT WELL!!!