Preparing to go credit card-less for one month

My biggest concerns are safety, not having enough cash on me, and figuring out what to do about online purchases that require credit. I’ve decided to keep paying two bills - cell phone and student loan – as I have in the past, through a transfer from my checking account. These bills are consistent month to month and I don’t have the option to not pay them. My focus is on how using cash changes my day-to-day spending, not my fixed expenses. Remember how I got into this mess?