Working by Table and Crystal
The method of working described in Trithemius's Art of Drawing Spirits into Crystals is pretty simple and straight forward. You can easily go through the text and figure out how to use it. If you want something streamlined to just grab and utilize, that is what this is with a few additions.
The tools needed are a scrying crystal, this should be small, and have a sense of drawing you into its space. You will need a black wand, on one side paint in gold “AGLA, ON, TETRAGRAMMATON” on the other “EGO ALPHA ET OMEGA”. The crystal sits on a pedestal, any pedestal will do, but ideally a golden pedestal with the names of the angels “Michael, Raphael, Gabriel, Uriel” forming a ring around it along with the letters of the four fold name. You'll need taper candles and candle holders, and an incense burner with incense. Finally you'll need the table. Any flat surface can be painted on for this. It is bounded by three concentric circles (forming two concentric rings) with a triangle in the middle. The outer ring has the names of the archangels and their seals, and the inner ring has the names of the four demon kings. Pull out your magic ring, and if you want your robe. With these items and some holy water you're pretty much set to go.
The seals for the angels can be pulled from The Magical Calendar. Pentacles can be designed using the methods given in Agrippa's On Magical Ceremonies, and Three Books of Occult Philosophy. They can also be pulled from The Magical Calendar.
This particular approach to the Art of Drawing Spirits into Crystals adds an opening to consecrate the temple. Another component added is an astrological invocation. The ritual is designed to be performed so that the magician summons the angel of the particular planetary hour in which he is working. If I want to conjure an angel who is not in that particular planetary hour I will look for where the planet is in the sky. Once I have identified the planet's zodiacal location I invoke the force of the particular sign in which the planet is during the time of the ritual. You could drop the opening or use another one, and you could drop the astrological invocation and just utilize the planetary hours. This ritual also changes some verbiage as it was originally performed with an OTO lodge.
With that all having been said, here is the ritual. This can be used as an example of how to personalize Trithemius's method, or you can use this text as is. In the example given Jupiter was being conjured and at the time Jupiter was in Scorpio.
Circumabulate with water, sprinkle water.
then the priest of fire must sprinkle the lustral water of the loud
resounding sea. Hear thou the voice of fire.
Circumambulate with fire.
Then will all the phantoms have vanished you will see that formless fire which darts and flashes in the hidden depths of the universe.
Circumambulate with incense.
Holy art thou lord of the universe, holy art thou whom nature hath not formed, holy art thou vast and mighty one, lord of light and of darkness.
Circumambulation Scorpio zodiacal seal. Make the appropriate Water pentagram and Mars hexagram in each quarter vibrating the name of the ruling zodiacal angel. Cross with the candle and the incense.
"Oh, Lord! who art the author of all good things, strengthen, I beseech thee, thy poor servant, that he may stand fast, without fear, through this dealing and work; enlighten, I beseech thee, oh Lord! the dark understanding of thy creature, so that his spiritual eye may be opened to see and know thy angelic spirits descending here in this crystal: (then lay thy hand on the crystal saying,) and thou, oh inanimate creature of God, be sanctified and consecrated, and blessed to this purpose, that no evil phantasy may appear in thee; or, if they do gain ingress into this creature, they may be constrained to speak intelligibly, and truly, and without the least ambiguity.”
Evocateur traces circle with wand.
"In the name of The Beloved, The Mother, and the Christos, I consecrate this piece of ground for our defence; so that no evil spirit may have power to break these bounds prescribed here, through the Power, Mercy, and Beauty"
Evocateur places incense in the censer.
“I conjure thee, oh thou creature of fire! by him who created all things both in heaven and earth, and in the sea, and in every other place whatever, that forthwith thou cast away every phantasm from thee, that no hurt whatsoever shall be done in any thing. Bless, oh Lord, this creature of fire, and sanctify it that it may be blessed, and that they may fill up the power and virtue of their odours”
"In the name of the Beloved, I do desire thee, thou strong mighty angel, Sachiel, for it is the divine will of him who is called YHVH, that thou take upon thee some shape as best becometh thy celestial nature, and appear to us visibly here in this crystal, and answer our demands in accordance with our Will and that of your office, and that thou wilt graciously shew us what things are most profitable for us to know and do, to the glory and honour of the divine Majesty.”
"O Lord, by thy name, we have called him, suffer him to administer unto us. And that all things may work together by Mercy, Power, and Beauty."
At this point the angel and the magician may communicate by way of the crystal.
Mighty angel, in the name of the Beloved, by the virtues of Power, Mercy, and Beauty, we thank the and bid the farewell that you might return again pleasantly to our service in the name of YHVH.