To use the Tarot properly, however, requires a very great deal of preparation, and the preparation does not consist merely in knowledge of the significance of the cards, but in getting in touch with the forces behind the cards. An adequate rule-of-thumb use of it, however, can be made by any sincere person for himself, though it is doubtful if he could use it satisfactorily for anyone else.
Obtain a new pack of Tarot cards, for a used one will be too full of other people's magnetism to be reliable, and carry them on the person, and sleep with them under the pillow, and handle them and ponder upon the meaning of the pictures in the light of what the book of instructions has to say about them until the significance of each picture is realized. It does not matter greatly which pack is used, whether the quaint, hideous, archaic ones, or the very beautiful ones redrawn in recent times for Mr. A.E. Waite; it is not the details of the cards that matter, but that they should serve as reminders, as it were, of the ideas underlying them. As soon as one perceives some sort of significance in the picture on a card, one has made a link with that card, and its appearance in the divination will mean something.
Having got in touch with one's chosen pack, the next thing is to lay out a divination according to whatever system is chosen, work it out according to the book, and note down the results obtained and the position in which the cards fell. Repeat the process a second time, and a third time, upon each occasion keeping accurate notes of the fall of the cards, and, of course, thoroughly shuffling the cards between each lay-out. If certain cards keep on coming up, and especially if they come up in approximately the same positions, or even if cards of the same type predominate through the three divinations, it may safely be concluded that the system is working satisfactorily, and a divination may be made on the basis of the recurring cards. But if the three divinations bear no resemblance to each other; if even the balance of the four suits does not remain constant for at least two out of the three, and if none of the Greater Trumps turn up more than once, then it must be concluded that the Tarot is not working for the diviner, and the divination should be abandoned. The same principles apply if divinations are done with ordinary playing-cards, though this method is not nearly so sensitive and comprehensive as Tarot divinations.
Divination is a thing that cannot be learnt out of books, but builds up gradually as a system of associated ideas in the mind of the operator. Moreover, one varies very much in one's capacity for divination; upon one occasion one may be absolutely inspired, the cards recur and recur, and one reads with the most extraordinary insight, one thing leading to another in an endless train; at another time, one may have to spell out the meaning of the lay-out with reference to the book for almost every card. It will always be found that it is useless to force a divination; if the interpretation does not leap spontaneously to the mind it is unlikely to contain much insight.
Practical Occultism in Daily Life, Dion Fortune, Aquarian, 1976