Hypothetically, you should not be taking out of your bankroll to pay bills or live. Ideally, you want to keep building your bankroll until it's big enough for you to play in the big events ( ie:- WSOP
or similar ). Once you have a big enough bankroll to do this, then maybe you can think about taking a little out to live. The bigger your bankroll, the bigger the games you can play & the more money you stand to make if you do finish in the money. But hey, its your money so whatever you think is O'K' to take out is fine. Just remember that whatever you take out is less for you to buy-in with & that bankroll was hard earned.
Hope this helped a little,
Best of luck & see you @ the final table, yeah ?