sorry to resurrect this old thread,
but i cant see why you cant keep a day job and play music ? well yeah, its hard to get an audition, but what do you expect ? wont it be a better feeling when you finally get the spot ? Lets say your an engineer or your a nurse or something of the like, I guess as an engineer in a firm or something, you might be able to take a break or a day off to go audition ? and if you get the spot, and your sure its a "safe" job, as in your there to stay, cause your comfortable with the section/conductor, the pieces you play etc, you might feel ready to quit your day job, you can also get a reputation in the orchestral/jazz scene when you join a symphony/jazz band. then you might get offers from different orchestras, or it might give you a boost when you audition for another orchestra/jazz band.