The preparation called for in the book concerns firstly, contact with one's Perfect Nature. This is an important key to the method of Picatrix and described in Book 3, Chapter 6.
Secondly, a period of fasting and abstention from sensuality is called for, 7 days prior to the work to be done for example. A recommendation is made to consume foods during that time that are primarily suited to the planet to be petitioned.
Thirdly, the worker is called upon to dress themselves in a manner that relates to the specific planet being called up, for example as a scribe for Mercury, or as a soldier or general for Mars.
Fourthly, ideally the location the work is done at should be suited to the planet, and there are listings of the types of locations suited to each planet.
Read Picatrix Book 3, chapter 6.
Picatrix is an amazing Arabic grimoire from the Medieval period, translated to Latin in Andalusia, Spain during the height of that region as a province of the Maghreb or Morocco. An excellent introduction can be found on the Renaissance Astrology site.
Further overview is available on Joe Peterson's site.
This site contains thematically organized practical extracts from Picatrix. These concern both the preparation of the sage as well as the instructions specific to particular planets or stellar constellations.
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