aurafields
It is pretty easy to tell if someone doesn't believe in having a reading, but I never acknowledge their disbelief. If they came for a reading, I give them a reading. I will say something like,"Try to relax and just hear what I have to say, take what you want from this, but I am pretty sure int he days and months to come you will find that the information I am giving you is both accurate and can be helpful as situations unfold for you." I know what I do in a reading is channeled and that the person is there for a reason for his or her best good as well as my own, as that is why I give the reading and how I cme to the reading. They can take it or leave it, stay or go, but if they come to me, I give them what I've got, and they don't get to tell me they don't believe. They may not yet understand, but they believe something or they wouldn't be here, and in time I have the faith and knowing from experience both personally and professionally that they will begin to see what they came to see.Sometimes I'll come across someone who I can't seem to read very well for... and I'll get a certain feeling about that... so I will ask the person, "you don't really believe in this, do you?", to which they generally respond "no, not really", so then I tell them "well, then I cannot read for you". And then I pick up my cards and I'm done, with no further discussion.
If you're afraid of being "wrong" then I suggest trying some exercises that help you let go of the "inner critic". Try some free writing exercises.
When I practice, I find it helps to tell my friends and family to take the reading with a grain of salt, because it is just a practice reading. Then they know what to expect, and that makes me feel better and more relaxed. Practice makes perfect, but it doesn't have to be perfect.