Writers sometimes have this picture of half starving in a cold attic as they write. No, don't do it. Take care of yourself. If you need to take a day job to pay the bills, do it and consider it research for future books. Always take care of your Earthly needs. There will be things you'll learn in your day job that will come to play in your writing--the interactions between people, the technical aspects of certain professions, the change to examine different personalities, the opportunity to do new tasks, be a part of team project, etc. All of this is research that will give you a wealth of character and plot background information. Remember always change the sex and names of characters to protect the innocent or the guilty. In the meantime, cherish your research.