Supposedly several exposures of x-rays will not hurt. Having to buy a lithium battery at a 7-11 can be a costly lesson. If you have a removable flash, test it before shooting to be sure the connection to your camera is secure. If you have a camera that requires you to set the shutter speed for flash, be sure you do. 15 year old film stored in a freezer still works.
Nicad batteries are a pain, but they do recycle a flash quickly.
Off-brand films work well for snapshots. In fact they do not suffer from the bad reputation they had years ago. Stay away from Seattle Film Works film and its clones. If you purchase mail order, never give your credit card information until you confirm they have the item and a date they will ship. Never assume that what the film processor gives you as a print is always the best it can be.