Learn banishing, cleansing, grounding, do them regularly, I say you will be fine most of the time.That wont keep you against big cannons out there but big cannons arent straight up malicious even when they might not like you.
Its fine, after all its first time.Just learn banishing like I said.
Well if you dont know what you are doing, eventually, but dont worry, you have to really try to fuck up for messing things up as a newbie.