It’s a process, to change the way they perceive, and behave, in a place. To break the habits. First, you remove them from the place. This takes time, in days, or weeks, or in months. However long it takes, is how long it takes. Once they’ve been thoroughly removed you can begin to reintroduce them, in the way that you want them to be introduced. Know that everything you do at this stage will shape how they behave in the future. Your challenge is to mould their behavior without breaking them.
You must exert your will enough to get the proper response, and not so much that they become nervous, or fearful. This is made more challenging if they are nervous to begin with, or if you are. A bad experience at this point and you have to start over, so work slowly. Take small steps, and set them up to succeed. Don’t become overconfident, and don’t overreact, ever.
Things are usually only a big deal if you make them into a big deal. Compelling them to behave the way you want is not a matter of emotion, it is a matter of course. You are not asking them to submit to you, but to an immutable law of nature. If you hold this truth in your mind, if you make yourself law, they will follow.
The point is this: when you introduce someone to a new way of being, you must show them slowly. If you correct them for behaving in a way that you have allowed them to behave for months or years, they will be understandably upset. Model the behavior that you desire…teach them the expectation. Then show them when they make a mistake. But correct them when they choose to do wrong.