I'm worried about leaving one job without having another job to go to

If you leave a career-related job before finding another one, here are some things to keep in mind:

• Try to leave your current situation on good terms, as you may need a reference. If you're planning to move from the area or do some travelling before looking for another job, it might be wise to ask your supervisor for a letter of reference to take with you. 
• Be wary of job-hopping - staying a year here, a year there in a series of jobs that don't show a career progression. Employers can be hesitant to hire people who have a history of leaving after a year and may wonder if you lack focus.
• If you decide to take a break from work precisely because you don't know what you want to do career wise, then make a Career action plan before you go, so that you are ready to implement it on your return. Spend six months or a year doing volunteer work; work your way across Europe, Australia or Canada; or enrol in a course you always wanted to take.  If you figure out your "life's work" in the process, you'll be able to describe the skills you've developed, why you took the time off and what you have to offer to any employer!