This one might not seem important, but not bringing a lock to my first class — and then not realising that they were apparently available to rent — did change my experience. Instead of getting excited while waiting for the instructor, I sat there stretching, worrying about my valuables in the locker room. It's not that I actually expected anyone to steal anything, but being in a new place and watching everyone around me lock up their stuff made me nervous. That's not the headspace you want to be in for your first class, especially if you're totally new to yoga and already on edge.