100% your decision, so you do you… but like others have said, I think it is beneficial to join when you first get to your facility to at least see it for yourself. I will say that there’s a lot management can and will do to violate the contract in their favor since they have some incentives to do so, and having some support in dealing with that helps. Not only that, but there’s a lot of scenarios that can pop up in training where you may need a little bit of backup with handling. Does the union have an obligation to protect your rights regardless? Yes. Will they go out of the way to help a non-member? Maybe, maybe not. Up to you and whatever game you choose to play.