If an artist is serious about making music his or her career, then quit the day job immediately. The clock is ticking and there is no time to waste. To beat the competition requires a 100% full time commitment to the band. The building process takes years for most, so start now. There are countless ways to make money in music while at the same time moving the career forward (e.g., tour, film/tv placement, sell merch). Worst case, there is always grandma, girlfriend, dad, aunt, investor, credit card, etc to keep a person going until they are self sufficient. So, no excuses.
Ben McLane Esq