Mine was also left side so they teach you a breath holding technique that protects your heart. They have ways to help you with this. They have you go for a , I call it mapping where you will do breath holding and they put tiny little dots in a few places that help them line you up for treatment. They usually give you time to practice before any treatments, I believe if people have medical problems with holding the breath they have another option to help with that. It is doable and treatments don't take long. You will be amazed at how little time if takes and then you go about your day. Usually you check in with in my case a nurse and she asked how I was doing, this was once a week. I am 2 years past treatment and doing well. Ask questions of your team any time you need too.
Good luck and thinking of you.