While I don't play on PS4, I understand the frustration. Even when I have an easier time because of the ability to click, it's best to keep in perspective in a 24 man raid. As a healer, you are responsible for your party, if you help in other parties, that's a bonus, don't expect to heal, your AOES heal your party and not others parties, work with your mechanics and if the MT is taking too much damage, throw a regen or a shield, help out, but remember, just like other healing orders, your party is your responsibility. And above all, have fun, don't stress so hard, people can, will and do make mistakes. It's been said here already but it bears repeating. Forgive yourself, forgive others, we're here to have fun and enjoy ourselves, not stress out. The more you do content, the better you will get at it.