My Unbreakable Rules
These are some rules I've formed over the brief time I've been pro:
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1. Make sure the querent is comfortable in every which way possible. A little effort, like offering herbal tea with honey goes a long way.
2. Before beginning a reading, ask the querent if they have anything to ask about the tarot, or whatever service you are offering to them. If they do, answer it honestly, without using too many complicated 'technical' terms.
3. Interpret the cards in a clear concise manner. Make sure you can relate the cards to the querent, and always ask them if they can connect to what you're saying. (Some querents keep mum until the reading is done, only to say that they couldn't really find any accuracy in the interpretation).
4. Never ever scare the querent. The tower doesn't always mean that they are going to suffer a breakdown, The Devil doesn't mean they're cursed to suffer in hell, and Death doesn't mean "DEATH".
5. Even if the above three cards do appear in a reading, interpret them in a way where the querent understands their severity, but is empowered enough to face the obstacles they present whole heartedly. An empowered querent is a happy and satisfied querent.