I've met a lot of tarot readers during my time down here on the planet, and each and every one of them had a different belief system operating behind the tools that they used. One of my pet hates in people is that they assume their word should be taken as law. Some readers honestly believe that the client shouldn't question what they say. Those same readers also believe that if a reading doesn't happen exactly as predicted then it's the client's fault, and they must've interfered with fate and changed the course of events. Sometimes, they'll even say that a client has blocked something magical from happening because they are less evolved. I've heard others say their readings are never wrong and that if that's what has been given to them by their higher power known as (insert deity here) then it has to be right.
Being a Leo (a 9th house Sun & Mercury), I can be incredibly bossy, and I've even been known to be dogmatic and conceited. I remember times when I would throw words around like confetti without so much of a thought as to what I was actually saying. Hindsight has shown me far more than foresight ever could and as I sit here now I am humble enough to accept that my word was not what I thought it was. The problem was, I didn't think about what I was saying. For those of you who know a little about astrology; I imagine you're laughing at the irony of a 9th house Leo Mercury complaining about people having issues with mental superiority (I have Jupiter in the 3rd too!), but what can I say? I am learning. And to be honest, my conceit doesn't stretch all that far. I didn't ever assume a reading I did would be 100% accurate, and it didn't matter how many times I got it right. I always held onto the possibility that I could get it wrong. I never lacked confidence in what I did, but I could accept that I wasn't omnipotent; my immortal self only comes out to play when I'm taking off on a flight of fancy. For the non-astrologically inclined, I'm trying to say that arrogance and assumption are not beneath me.
With that being said, to assume that the client should value your opinion is healthy. It shows that you value your work.
To assume that you can probably give them information they don't have access to is also healthy. It shows that you know what you're doing and that you have developed the tools necessary to look beneath the superficial.
To assume that the client should take your advice above their own inner voice is wrong. It shows that you value your own self-importance above their individuality.
To assume that the client sees you as an authority on their life is a potential abuse of privilege. It shows that you have issues accepting responsibility for your own life. Confused? Anyone who has developed autonomy knows that they are the ones in control of their own decisions. It's always good to get an outside opinion, but that's all it is, an opinion. It may well be an informed opinion, but it doesn't change the fact that it's just an opinion.
It's not always easy to get the balance right, and if you can't acknowledge this, then you're in danger of getting it wrong. Ideally; you'll achieve a healthy amount of confidence in your abilities without resorting to inflating your own self-importance at the expense of the client. You have to be able to recognise your limits as a human being. Those in the biggest danger of not recognising boundaries are those with strong beliefs. The stronger or more powerful the belief system - the greater the chance of the reader assuming they are somehow above the client regarding personal evolution.
Being a reader is a service. You're relaying information from a moment in time to help the client with something they consider to be important. Obviously, you have to have a degree of confidence in what you're passing on, but you are capable of having an open mind too. It's not up to you how the client uses the information you give them. You can't afford to take it personally if they ignore warnings or refuse to take it word for word. How they process and act on the information you give them is their responsibility and their right.