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Yes, it is possible. I work for the first online data science bootcamp (www.k2datascience.com).
We tell students to cancel all social events and avoid any vacations or trips. You go to work and you study data science. That is the sacrifice that is necessary to maintain your income and successfully transition careers.
As our courses meet 50 hours a week from 8am-6pm, and recommended time spent out of class studying on your own is 10+ hours, I strongly recommend not working 40 hours a week as well.
We do have living expense loans available through our lenders though to cover bills, food, etc and offer free housing for students who live more than 50 miles from campus making it very possible to quit your job so you can focus on the program.
Additionally our students are finding employment within 30 days of finishing their courses on average, often time sooner.