WHAT THE KEY OF SOLOMON ASKS OF ITS OPERATOR
The Key of Solomon is written in the second person throughout. Thou shalt, thou must. It is a manual for the person doing the work, and the largest part of it is not about spirits at all - it is about the operator, and what the operator is required to become before anything else begins.
What follows is quoted, not prescribed. We print it so you can see what the text actually asked. Whether anyone does any of it is entirely their own affair, and nothing here is instruction.
The preparation, as Book II gives it
From the first day of the Experiment, it is absolutely necessary to ordain and to prescribe care and observation, to abstain from all things unlawful, and from every kind of impiety, impurity, wickedness, or immodesty, as well of body as of soul.Key of Solomon, Book II (Mathers ed., 1889, public domain)

The passage continues into specifics - no excess in eating or drinking, no idle or slanderous talk, honest speech and good deeds in their place. The tone is closer to a monastic rule than to anything a modern reader expects from a grimoire.
Elsewhere the same book asks for a concealed place removed from the habitations of men, though it concedes that one's own chamber will serve if it has been purified; for companions in the work, and, failing companions, for a faithful and attached dog; and for light, on the grounds that fire has been used in sacred things by every nation.
The editor drew a line
I must further caution the practical worker against the use of blood; the prayer, the pentacle, and the perfumes, rightly used, are sufficient; and the former verges dangerously on the evil path.S. L. MacGregor Mathers, editor's preface, 1889

That is Mathers, in his own preface, about his own edition. He identified two experiments in the manuscripts as belonging to black magic, excluded material he considered dangerous, and warned his readers off the use of blood in the plainest terms available to a Victorian.
It is a useful corrective to the way this book is usually invoked. The man who put it into English was not selling transgression. He thought parts of the tradition were a mistake and said so on the way in.
Rite, instrument, honest gap
Rite
The Key sets conditions on the operator before any operation: abstinence and restraint from the first day of the experiment, a purified and secluded place, companions, prepared light, and instruments that have never served another purpose. The text treats these as binding, not as atmosphere.
Instrument
One thing here is fully checkable, and it is not the efficacy - it is the count. Any given working either satisfies these conditions or it does not, and the number satisfied can be stated honestly. Our own documents carry that count on their face: how many of the conditions were observed, and how many cannot be verified at all.
The timing conditions are computable to the minute. The conditions of the person are not computable by anyone, which is precisely why they should be reported and never scored.
Honest gap
Whether any of this changes an outcome is untouched by measurement, and we claim nothing. What can be said is that the text asks a great deal of the operator and comparatively little of the spirits, which tells you what kind of document it thought it was.
That is the strongest honest reading available: the discipline is the visible part, the effect is not, and the book is far more interested in the first than modern retellings suggest.
Questions the sources get asked
Does the Key of Solomon require fasting?
It requires abstinence from excess and from what it calls all things unlawful, of body and soul alike, from the first day of the experiment - listing overeating and overdrinking alongside idle talk and slander. It reads closer to a monastic rule than to a diet.
Why does the text mention a dog?
Book II asks for three companions in any operation carried out in the circle, and adds that an operator who cannot find companions should at least have with him a faithful and attached dog. It is quoted here exactly as it stands.
Is this a set of instructions I should follow?
No. Everything on this page is reported from a public-domain text so you can see what it asked of its readers. Nothing here is instruction, medical or otherwise, and no outcome is claimed for any of it.
The Solomonic Guide quotes the Key's conditions in full, computes your hours to the minute, and stamps the document with how many conditions were actually observed.
The Solomonic Guide · $18.98